diff --git a/modules/account_dunning_email/account.py b/modules/account_dunning_email/account.py
index 5421d65d44..299a28afda 100644
--- a/modules/account_dunning_email/account.py
+++ b/modules/account_dunning_email/account.py
@@ -1,7 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model import fields
 from trytond.pool import Pool, PoolMeta
 from trytond.pyson import Bool, Eval
diff --git a/modules/account_dunning_email/ir.py b/modules/account_dunning_email/ir.py
index 21f2c4cf77..e45c44e930 100644
--- a/modules/account_dunning_email/ir.py
+++ b/modules/account_dunning_email/ir.py
@@ -4,8 +4,7 @@
 from sql import Table
 from sql.operators import Concat
 
-from trytond import backend
-from trytond.config import config
+from trytond import backend, config
 from trytond.model import fields
 from trytond.pool import PoolMeta
 from trytond.pyson import Eval
diff --git a/modules/account_es_sii/account.py b/modules/account_es_sii/account.py
index f072a388f6..4369058a6a 100644
--- a/modules/account_es_sii/account.py
+++ b/modules/account_es_sii/account.py
@@ -9,7 +9,7 @@ from zeep import Client
 from zeep.exceptions import Error as ZeepError
 from zeep.transports import Transport
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import Index, ModelSQL, ModelView, Unique, Workflow, fields
 from trytond.model.exceptions import AccessError
@@ -21,9 +21,6 @@ from trytond.transaction import Transaction
 
 from .exceptions import ESSIIPostedInvoicesError
 
-CERT = (
-    config.get('account_es_sii', 'certificate'),
-    config.get('account_es_sii', 'privatekey'))
 SEND_SIZE = 10000
 
 
@@ -79,15 +76,19 @@ class CredentialSII(ModelSQL, CompanyValueMixin):
     def get_client(cls, endpoint, **pattern):
         pool = Pool()
         Configuration = pool.get('account.configuration')
-        config = Configuration(1)
-        url = WS_URL.get(config.get_multivalue('es_sii_url', **pattern), '')
+        configuration = Configuration(1)
+        url = WS_URL.get(
+            configuration.get_multivalue('es_sii_url', **pattern), '')
         if not url:
             raise AccessError(
                 gettext('account_es_sii.msg_missing_sii_url'))
         service = endpoint
-        environment = config.get_multivalue('es_sii_environment', **pattern)
+        environment = configuration.get_multivalue(
+            'es_sii_environment', **pattern)
         session = Session()
-        session.cert = CERT
+        session.cert = (
+            config.get('account_es_sii', 'certificate'),
+            config.get('account_es_sii', 'privatekey'))
         transport = Transport(session=session)
         client = Client(url + endpoint + '.wsdl', transport=transport)
         if environment == 'staging':
diff --git a/modules/account_export/account.py b/modules/account_export/account.py
index 21d9ef6e6a..de8242ff66 100644
--- a/modules/account_export/account.py
+++ b/modules/account_export/account.py
@@ -1,7 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import ModelSQL, ModelView, Workflow, fields
 from trytond.model.exceptions import AccessError
diff --git a/modules/account_fr/account.py b/modules/account_fr/account.py
index 5e00d85e23..966d8a4754 100644
--- a/modules/account_fr/account.py
+++ b/modules/account_fr/account.py
@@ -7,18 +7,13 @@ from sql import Table
 from sql.aggregate import Sum
 from sql.conditionals import Coalesce
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model import ModelStorage, ModelView, fields
 from trytond.pool import Pool, PoolMeta
 from trytond.pyson import Eval
 from trytond.transaction import Transaction
 from trytond.wizard import Button, StateTransition, StateView, Wizard
 
-OPENING_CODE = config.get('account_fr', 'fec_opening_code', default="OUV")
-OPENING_NAME = config.get(
-    'account_fr', 'fec_opening_name', default="Balance Initiale")
-OPENING_NUMBER = config.get('account_fr', 'fec_opening_number', default="0")
-
 
 class AccountTemplate(metaclass=PoolMeta):
     __name__ = 'account.account.template'
@@ -215,9 +210,15 @@ class FrFEC(Wizard):
             else:
                 debit, credit = 0, -balance
             yield [
-                OPENING_CODE,
-                OPENING_NAME,
-                OPENING_NUMBER,
+                config.get(
+                    'account_fr', 'fec_opening_code',
+                    default="OUV"),
+                config.get(
+                    'account_fr', 'fec_opening_name',
+                    default="Balance Initiale"),
+                config.get(
+                    'account_fr', 'fec_opening_number',
+                    default="0"),
                 format_date(self.start.fiscalyear.start_date),
                 code,
                 name,
diff --git a/modules/account_fr_chorus/account.py b/modules/account_fr_chorus/account.py
index b18374720d..b0f0df037f 100644
--- a/modules/account_fr_chorus/account.py
+++ b/modules/account_fr_chorus/account.py
@@ -10,7 +10,7 @@ from oauthlib.oauth2 import BackendApplicationClient, TokenExpiredError
 from requests_oauthlib import OAuth2Session
 from sql.functions import CharLength
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import ModelSQL, ModelView, Unique, Workflow, fields
 from trytond.model.exceptions import AccessError
@@ -35,7 +35,6 @@ EDOC2SYNTAX = {
 EDOC2FILENAME = {
     'edocument.uncefact.invoice': 'UNCEFACT-%s.xml',
     }
-TIMEOUT = config.getfloat('account_fr_chorus', 'requests_timeout', default=300)
 if config.getboolean('account_fr_chorus', 'filestore', default=False):
     file_id = 'data_file_id'
     store_prefix = config.get(
@@ -150,15 +149,17 @@ class CredentialChorus(ModelSQL, CompanyValueMixin):
         headers = {
             'cpro-account': base64.b64encode(account.encode('utf-8')),
             }
+        timeout = config.getfloat(
+            'account_fr_chorus', 'requests_timeout', default=300)
         try:
             resp = session.post(
                 url, headers=headers, json=payload,
-                verify=True, timeout=TIMEOUT)
+                verify=True, timeout=timeout)
         except TokenExpiredError:
             cls._get_token(session)
             resp = session.post(
                 url, headers=headers, json=payload,
-                verify=True, timeout=TIMEOUT)
+                verify=True, timeout=timeout)
         resp.raise_for_status()
         return resp.json()
 
diff --git a/modules/account_invoice/invoice.py b/modules/account_invoice/invoice.py
index dce39cdf67..4d6485c036 100644
--- a/modules/account_invoice/invoice.py
+++ b/modules/account_invoice/invoice.py
@@ -12,8 +12,7 @@ from sql.conditionals import Coalesce
 from sql.functions import CharLength, Round
 from sql.operators import Exists
 
-from trytond import backend
-from trytond.config import config
+from trytond import backend, config
 from trytond.i18n import gettext
 from trytond.model import (
     DeactivableMixin, Index, ModelSQL, ModelView, Unique, Workflow, dualmethod,
diff --git a/modules/account_payment_braintree/account.py b/modules/account_payment_braintree/account.py
index 490796b023..9d6b69bf97 100644
--- a/modules/account_payment_braintree/account.py
+++ b/modules/account_payment_braintree/account.py
@@ -14,8 +14,8 @@ except ImportError:
     class GatewayTimeoutError(Exception):
         pass
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.i18n import gettext
 from trytond.model import (
     DeactivableMixin, Index, ModelSQL, ModelView, Workflow, fields)
diff --git a/modules/account_payment_sepa/payment.py b/modules/account_payment_sepa/payment.py
index 05a1cd368e..5e9902ef57 100644
--- a/modules/account_payment_sepa/payment.py
+++ b/modules/account_payment_sepa/payment.py
@@ -15,7 +15,7 @@ from genshi.template.astutil import ASTCodeGenerator, ASTTransformer
 from lxml import etree
 from sql import Literal, Null
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import (
     Index, ModelSQL, ModelView, Unique, Workflow, dualmethod, fields)
diff --git a/modules/account_payment_stripe/payment.py b/modules/account_payment_stripe/payment.py
index 63a2255b66..30f0e39d41 100644
--- a/modules/account_payment_stripe/payment.py
+++ b/modules/account_payment_stripe/payment.py
@@ -10,8 +10,8 @@ from operator import attrgetter
 
 import stripe
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.i18n import gettext
 from trytond.model import (
     DeactivableMixin, Index, ModelSQL, ModelView, Unique, Workflow, dualmethod,
diff --git a/modules/account_statement/statement.py b/modules/account_statement/statement.py
index f67a8b6160..07c7bb708f 100644
--- a/modules/account_statement/statement.py
+++ b/modules/account_statement/statement.py
@@ -10,7 +10,7 @@ from sql.conditionals import Coalesce
 from sql.functions import CharLength
 from sql.operators import Concat
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import (
     Check, DictSchemaMixin, Index, ModelSQL, ModelView, Workflow, fields,
diff --git a/modules/authentication_saml/routes.py b/modules/authentication_saml/routes.py
index bb84014dd7..7ba7e05f78 100644
--- a/modules/authentication_saml/routes.py
+++ b/modules/authentication_saml/routes.py
@@ -13,7 +13,7 @@ import saml2
 import saml2.client
 import saml2.config
 
-from trytond.config import config
+import trytond.config as config
 from trytond.protocols.dispatcher import register_authentication_service
 from trytond.protocols.wrappers import (
     Response, abort, allow_null_origin, exceptions, redirect, with_pool,
diff --git a/modules/authentication_sms/res.py b/modules/authentication_sms/res.py
index fbe354409f..c0e5882f01 100644
--- a/modules/authentication_sms/res.py
+++ b/modules/authentication_sms/res.py
@@ -4,7 +4,7 @@ import datetime
 import logging
 import random
 
-from trytond.config import config
+import trytond.config as config
 from trytond.exceptions import LoginException
 from trytond.i18n import gettext
 from trytond.model import Index, ModelSQL, fields
@@ -15,11 +15,10 @@ logger = logging.getLogger(__name__)
 
 
 def send_sms(text, to):
-    if config.has_option('authentication_sms', 'function'):
-        func = resolve(config.get('authentication_sms', 'function'))
-        if func:
-            from_ = config.get('authentication_sms', 'from', default=None)
-            return func(text, to, from_)
+    if func := config.get('authentication_sms', 'function', default=None):
+        func = resolve(func)
+        from_ = config.get('authentication_sms', 'from', default=None)
+        return func(text, to, from_)
     logger.error('Could not send SMS to %s: "%s"', to, text)
 
 
diff --git a/modules/authentication_sms/tests/test_module.py b/modules/authentication_sms/tests/test_module.py
index 779e526822..1d22fc68b6 100644
--- a/modules/authentication_sms/tests/test_module.py
+++ b/modules/authentication_sms/tests/test_module.py
@@ -2,7 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 import datetime
 
-from trytond.config import config
+import trytond.config as config
 from trytond.exceptions import LoginException
 from trytond.pool import Pool
 from trytond.tests.test_tryton import ModuleTestCase, with_transaction
diff --git a/modules/company/company.py b/modules/company/company.py
index 813d915fc7..e86f5e311d 100644
--- a/modules/company/company.py
+++ b/modules/company/company.py
@@ -11,7 +11,7 @@ try:
 except ImportError:
     PIL = None
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import (
     MatchMixin, ModelSQL, ModelView, Unique, fields, sequence_ordered)
diff --git a/modules/currency/ir.py b/modules/currency/ir.py
index 7f8e727a5a..ead7a504b8 100644
--- a/modules/currency/ir.py
+++ b/modules/currency/ir.py
@@ -1,6 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.config import config
+
+import trytond.config as config
 from trytond.model import fields
 from trytond.pool import PoolMeta
 
diff --git a/modules/currency_ro/currency.py b/modules/currency_ro/currency.py
index 4dae5a21d8..22458ad7bd 100644
--- a/modules/currency_ro/currency.py
+++ b/modules/currency_ro/currency.py
@@ -6,14 +6,13 @@ from decimal import Decimal
 import requests
 from lxml import etree
 
-from trytond.config import config
+import trytond.config as config
 from trytond.modules.currency.currency import CronFetchError
 from trytond.pool import PoolMeta
 from trytond.pyson import Eval, If
 
 URL_10DAYS = 'https://bnr.ro/nbrfxrates10days.xml'
 URL_YEAR = 'https://bnr.ro/files/xml/years/nbrfxrates%s.xml'
-TIMEOUT = config.getfloat('currency_ro', 'requests_timeout', default=300)
 
 
 class Cron(metaclass=PoolMeta):
@@ -35,8 +34,10 @@ class Cron(metaclass=PoolMeta):
             url = URL_10DAYS
         else:
             url = URL_YEAR % date.year
+        timeout = config.getfloat(
+            'currency_ro', 'requests_timeout', default=300)
         try:
-            response = requests.get(url, timeout=TIMEOUT)
+            response = requests.get(url, timeout=timeout)
         except requests.HTTPError as e:
             raise CronFetchError() from e
         tree = etree.fromstring(response.content)
diff --git a/modules/currency_rs/currency.py b/modules/currency_rs/currency.py
index 53c4f80a8b..f9cda125ef 100644
--- a/modules/currency_rs/currency.py
+++ b/modules/currency_rs/currency.py
@@ -6,8 +6,8 @@ from lxml import objectify
 from zeep import Client, Transport
 from zeep.exceptions import Error
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.i18n import gettext
 from trytond.model import fields
 from trytond.modules.currency.currency import CronFetchError
@@ -19,11 +19,11 @@ from .exceptions import RSCredentialWarning
 URL = (
     'https://webservices.nbs.rs/CommunicationOfficeService1_0/'
     'ExchangeRateXmlService.asmx?WSDL')
-TIMEOUT = config.getfloat('currency_rs', 'requests_timeout', default=300)
 
 
 def get_client(username, password, license_id):
-    client = Client(URL, transport=Transport(operation_timeout=TIMEOUT))
+    timeout = config.getfloat('currency_rs', 'requests_timeout', default=300)
+    client = Client(URL, transport=Transport(operation_timeout=timeout))
     client.set_default_soapheaders({
             'AuthenticationHeader': {
                 'UserName': username,
diff --git a/modules/document_incoming/document.py b/modules/document_incoming/document.py
index 3166a43b77..9085c16802 100644
--- a/modules/document_incoming/document.py
+++ b/modules/document_incoming/document.py
@@ -7,7 +7,7 @@ from io import BytesIO
 
 from pypdf import PdfReader, PdfWriter
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import (
     DeactivableMixin, ModelSingleton, ModelSQL, ModelView, Workflow, fields)
diff --git a/modules/document_incoming/routes.py b/modules/document_incoming/routes.py
index af2c789abe..80732277a2 100644
--- a/modules/document_incoming/routes.py
+++ b/modules/document_incoming/routes.py
@@ -3,7 +3,7 @@
 
 import base64
 
-from trytond.config import config
+import trytond.config as config
 from trytond.protocols.wrappers import (
     HTTPStatus, Response, abort, set_max_request_size, user_application,
     with_pool, with_transaction)
diff --git a/modules/inbound_email/inbound_email.py b/modules/inbound_email/inbound_email.py
index 75bc1115d5..70ce79fc2a 100644
--- a/modules/inbound_email/inbound_email.py
+++ b/modules/inbound_email/inbound_email.py
@@ -11,7 +11,7 @@ from email.policy import default as email_policy_default
 from email.utils import getaddresses
 from functools import partial
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model import (
     ModelSQL, ModelStorage, ModelView, fields, sequence_ordered)
 from trytond.pool import Pool
diff --git a/modules/inbound_email/routes.py b/modules/inbound_email/routes.py
index 2deb781b36..2a6e0d0865 100644
--- a/modules/inbound_email/routes.py
+++ b/modules/inbound_email/routes.py
@@ -3,7 +3,7 @@
 
 import json
 
-from trytond.config import config
+import trytond.config as config
 from trytond.protocols.wrappers import (
     HTTPStatus, Response, abort, set_max_request_size, with_pool,
     with_transaction)
diff --git a/modules/ldap_authentication/res.py b/modules/ldap_authentication/res.py
index 32612083f5..3319780522 100644
--- a/modules/ldap_authentication/res.py
+++ b/modules/ldap_authentication/res.py
@@ -7,7 +7,7 @@ import urllib.parse
 import ldap3
 from ldap3.core.exceptions import LDAPException
 
-from trytond.config import config, parse_uri
+import trytond.config as config
 from trytond.exceptions import LoginException
 from trytond.i18n import gettext
 from trytond.model.exceptions import AccessError
@@ -24,7 +24,7 @@ if 'ldap' not in urllib.parse.uses_query:
 
 def parse_ldap_url(uri):
     unquote = urllib.parse.unquote
-    uri = parse_uri(uri)
+    uri = config.parse_uri(uri)
     dn = unquote(uri.path)[1:]
     attributes, scope, filter_, extensions = (
         uri.query.split('?') + [''] * 4)[:4]
diff --git a/modules/ldap_authentication/tests/test_module.py b/modules/ldap_authentication/tests/test_module.py
index 3e6e0357ca..106872107f 100644
--- a/modules/ldap_authentication/tests/test_module.py
+++ b/modules/ldap_authentication/tests/test_module.py
@@ -7,7 +7,7 @@ from unittest.mock import ANY, MagicMock, Mock, patch
 
 import ldap3
 
-from trytond.config import config
+import trytond.config as config
 from trytond.modules.ldap_authentication.res import ldap_server, parse_ldap_url
 from trytond.pool import Pool
 from trytond.tests.test_tryton import ModuleTestCase, with_transaction
diff --git a/modules/marketing_automation/marketing_automation.py b/modules/marketing_automation/marketing_automation.py
index 02b47a79d8..e888c4b2af 100644
--- a/modules/marketing_automation/marketing_automation.py
+++ b/modules/marketing_automation/marketing_automation.py
@@ -24,7 +24,7 @@ from genshi.template import TextTemplate
 from sql import Literal
 from sql.aggregate import Count
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import (
     EvalEnvironment, Index, ModelSQL, ModelView, Unique, Workflow, dualmethod,
@@ -43,9 +43,6 @@ from trytond.wsgi import Base64Converter
 from .exceptions import ConditionError, DomainError, TemplateError
 from .mixin import MarketingAutomationMixin
 
-USE_SSL = bool(config.get('ssl', 'certificate'))
-URL_BASE = config.get('marketing', 'automation_base', default=http_host())
-URL_OPEN = urljoin(URL_BASE, '/m/empty.gif')
 logger = logging.getLogger(__name__)
 
 
@@ -646,6 +643,9 @@ class Activity(
         WebShortener = pool.get('web.shortened_url')
         Email = pool.get('ir.email')
         record = record_activity.record
+        url_base = config.get(
+            'marketing', 'automation_base', default=http_host())
+        url_open = urljoin(url_base, '/m/empty.gif')
 
         with Transaction().set_context(language=record.language):
             record = record.__class__(record.id)
@@ -655,7 +655,7 @@ class Activity(
 
         def unsubscribe(redirect):
             parts = urlsplit(urljoin(
-                    URL_BASE, quote('/m/%(database)s/unsubscribe' % {
+                    url_base, quote('/m/%(database)s/unsubscribe' % {
                             'database': Base64Converter(None).to_url(
                                 Transaction().database.name),
                             })))
@@ -691,7 +691,7 @@ class Activity(
                 elif kind is END and data == 'body':
                     yield START, (QName('img'), Attrs([
                                 (QName('src'), short(
-                                        URL_OPEN, 'on_email_opened')),
+                                        url_open, 'on_email_opened')),
                                 (QName('height'), '1'),
                                 (QName('width'), '1'),
                                 ])), pos
diff --git a/modules/marketing_email/marketing.py b/modules/marketing_email/marketing.py
index 13c739c2f9..2fb5f3641e 100644
--- a/modules/marketing_email/marketing.py
+++ b/modules/marketing_email/marketing.py
@@ -19,7 +19,7 @@ try:
 except ImportError:
     html2text = None
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.ir.session import token_hex
 from trytond.model import (
@@ -38,9 +38,6 @@ from trytond.wizard import Button, StateTransition, StateView, Wizard
 
 from .exceptions import EMailValidationError, TemplateError
 
-URL_BASE = config.get('marketing', 'email_base', default=http_host())
-URL_OPEN = urljoin(URL_BASE, '/m/empty.gif')
-
 
 def _add_params(url, **params):
     parts = urlsplit(url)
@@ -434,6 +431,9 @@ class Message(Workflow, ModelSQL, ModelView):
         spy_pixel = config.getboolean(
             'marketing', 'email_spy_pixel', default=False)
 
+        url_base = config.get('marketing', 'email_base', default=http_host())
+        url_open = urljoin(url_base, '/m/empty.gif')
+
         @lru_cache(None)
         def short(url, record):
             url = WebShortener(
@@ -456,7 +456,7 @@ class Message(Workflow, ModelSQL, ModelView):
                     elif kind is END and data == 'body' and spy_pixel:
                         yield START, (QName('img'), Attrs([
                                     (QName('src'), short(
-                                            URL_OPEN, str(message))),
+                                            url_open, str(message))),
                                     (QName('height'), '1'),
                                     (QName('width'), '1'),
                                     ])), pos
diff --git a/modules/marketing_email/tests/test_module.py b/modules/marketing_email/tests/test_module.py
index 0fbc63df42..40a27e76e1 100644
--- a/modules/marketing_email/tests/test_module.py
+++ b/modules/marketing_email/tests/test_module.py
@@ -3,7 +3,7 @@
 
 from unittest.mock import ANY, Mock, patch
 
-from trytond.config import config
+import trytond.config as config
 from trytond.modules.marketing_email import marketing as marketing_module
 from trytond.pool import Pool
 from trytond.tests.test_tryton import ModuleTestCase, with_transaction
@@ -26,21 +26,19 @@ class MarketingEmailTestCase(ModuleTestCase):
             'marketing', 'email_subscribe_url', default='')
         config.set('marketing', 'email_subscribe_url', SUBSCRIBE_URL)
         self.addCleanup(
-            lambda: config.set(
-                'marketing', 'email_subscribe_url', subscribe_url))
+            config.set, 'marketing', 'email_subscribe_url', subscribe_url)
         unsubscribe_url = config.get(
             'marketing', 'email_unsubscribe_url', default='')
         config.set('marketing', 'email_unsubscribe_url', UNSUBSCRIBE_URL)
         self.addCleanup(
-            lambda: config.set(
-                'marketing', 'email_unsubscribe_url', unsubscribe_url))
+            config.set, 'marketing', 'email_unsubscribe_url', unsubscribe_url)
         spy_pixel = config.get('marketing', 'email_spy_pixel', default='')
         config.set('marketing', 'email_spy_pixel', 'true')
         self.addCleanup(
-            lambda: config.set('marketing', 'email_spy_pixel', spy_pixel))
+            config.set, 'marketing', 'email_spy_pixel', spy_pixel)
         from_ = config.get('email', 'from', default='')
         config.set('email', 'from', FROM)
-        self.addCleanup(lambda: config.set('email', 'from', from_))
+        self.addCleanup(config.set, 'email', 'from', from_)
 
     @with_transaction()
     def test_subscribe(self):
diff --git a/modules/notification_email/ir.py b/modules/notification_email/ir.py
index cd1f132f20..9ae45ad6ba 100644
--- a/modules/notification_email/ir.py
+++ b/modules/notification_email/ir.py
@@ -3,8 +3,7 @@
 
 from sql import Table
 
-from trytond import backend
-from trytond.config import config
+from trytond import backend, config
 from trytond.model import fields
 from trytond.pool import Pool, PoolMeta
 from trytond.pyson import Eval
diff --git a/modules/notification_email/notification.py b/modules/notification_email/notification.py
index 983fcc4c1f..38980d170a 100644
--- a/modules/notification_email/notification.py
+++ b/modules/notification_email/notification.py
@@ -5,7 +5,7 @@ from email.utils import getaddresses
 
 from genshi.template import TextTemplate
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import ModelSQL, ModelView, fields
 from trytond.pool import Pool
diff --git a/modules/notification_email/tests/test_module.py b/modules/notification_email/tests/test_module.py
index a063061f21..5e02910c24 100644
--- a/modules/notification_email/tests/test_module.py
+++ b/modules/notification_email/tests/test_module.py
@@ -5,7 +5,7 @@ import sys
 import unittest
 from unittest.mock import patch
 
-from trytond.config import config
+import trytond.config as config
 
 try:
     from trytond.modules.company.tests import CompanyTestMixin
diff --git a/modules/party_relationship/party.py b/modules/party_relationship/party.py
index 19887421a2..c73869b120 100644
--- a/modules/party_relationship/party.py
+++ b/modules/party_relationship/party.py
@@ -8,14 +8,13 @@ from sql import As, Column, Literal, Null, Union, With
 from sql.aggregate import Min
 from sql.conditionals import Coalesce
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model import Index, ModelSQL, ModelView, convert_from, fields
 from trytond.pool import Pool, PoolMeta
 from trytond.pyson import Eval, If
 from trytond.transaction import Transaction
 
 dumps = partial(json.dumps, separators=(',', ':'), sort_keys=True)
-default_depth = config.getint('party_relationship', 'depth', default=7)
 
 
 class RelationType(ModelSQL, ModelView):
@@ -286,7 +285,9 @@ class Party(metaclass=PoolMeta):
         if party is None:
             party = context.get('related_party')
         if depth is None:
-            depth = context.get('depth', default_depth)
+            depth = context.get(
+                'depth',
+                config.getint('party_relationship', 'depth', default=7))
 
         if not party:
             return query
diff --git a/modules/product/ir.py b/modules/product/ir.py
index 799a83feae..03bbe4ab08 100644
--- a/modules/product/ir.py
+++ b/modules/product/ir.py
@@ -1,6 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.config import config
+
+import trytond.config as config
 from trytond.model import fields
 from trytond.pool import PoolMeta
 
diff --git a/modules/product/uom.py b/modules/product/uom.py
index dba6752b27..ea78bb4bb8 100644
--- a/modules/product/uom.py
+++ b/modules/product/uom.py
@@ -4,7 +4,7 @@
 from decimal import Decimal
 from math import ceil, floor, log10
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import (
     Check, DeactivableMixin, DigitsMixin, ModelSQL, ModelView, SymbolMixin,
diff --git a/modules/product_cost_fifo/product.py b/modules/product_cost_fifo/product.py
index 612d469dd4..2f8128ba84 100644
--- a/modules/product_cost_fifo/product.py
+++ b/modules/product_cost_fifo/product.py
@@ -3,7 +3,7 @@
 import datetime as dt
 from decimal import Decimal
 
-from trytond.config import config
+import trytond.config as config
 from trytond.modules.product import round_price
 from trytond.pool import Pool, PoolMeta
 
diff --git a/modules/product_image/product.py b/modules/product_image/product.py
index f1a7d699dc..b266182b8c 100644
--- a/modules/product_image/product.py
+++ b/modules/product_image/product.py
@@ -7,7 +7,7 @@ from urllib.parse import quote, urlencode, urljoin
 import PIL
 import PIL.Image
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import (
     MatchMixin, ModelSQL, ModelView, Unique, fields, sequence_ordered)
@@ -27,8 +27,6 @@ else:
     file_id = None
     store_prefix = None
 SIZE_MAX = config.getint('product', 'image_size_max', default=2048)
-URL_BASE = config.get('product', 'image_base', default='')
-URL_EXTERNAL_BASE = config.get('product', 'image_base', default=http_host())
 
 
 class ImageURLMixin:
@@ -68,8 +66,12 @@ class ImageURLMixin:
             return url
 
     def get_image_url(self, _external=False, **args):
+        url_base = config.get(
+            'product', 'image_base', default='')
+        url_external_base = config.get(
+            'product', 'image_base', default=http_host())
         return self._image_url(
-            URL_EXTERNAL_BASE if _external else URL_BASE, **args)
+            url_external_base if _external else url_base, **args)
 
     @property
     def images_used(self):
diff --git a/modules/product_image/routes.py b/modules/product_image/routes.py
index be4a043233..a6b7e9acb0 100644
--- a/modules/product_image/routes.py
+++ b/modules/product_image/routes.py
@@ -2,13 +2,11 @@
 # this repository contains the full copyright notices and license terms.
 from urllib.parse import unquote
 
-from trytond.config import config
+import trytond.config as config
 from trytond.protocols.wrappers import (
     HTTPStatus, Response, abort, with_pool, with_transaction)
 from trytond.wsgi import app
 
-TIMEOUT = config.getint('product', 'image_timeout', default=365 * 24 * 60 * 60)
-
 
 @app.route(
     '/product/image/<code>/<base64:database_name>',
@@ -92,6 +90,7 @@ def _image(request, pool, record):
 
     response = Response(image.get((width, height)), mimetype='image/jpeg')
     response.headers['Cache-Control'] = (
-        'max-age=%s, public' % TIMEOUT)
+        'max-age=%s, public' % config.getint(
+            'product', 'image_timeout', default=365 * 24 * 60 * 60))
     response.add_etag()
     return response
diff --git a/modules/product_price_list_dates/product.py b/modules/product_price_list_dates/product.py
index 8d167e92df..9c549f89cb 100644
--- a/modules/product_price_list_dates/product.py
+++ b/modules/product_price_list_dates/product.py
@@ -3,15 +3,12 @@
 
 import datetime as dt
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model import ModelView, fields
 from trytond.pool import Pool, PoolMeta
 from trytond.pyson import Date, Eval, If, PYSONDecoder, PYSONEncoder
 from trytond.transaction import Transaction
 
-_cache_days = config.getint(
-    'product_price_list_dates', 'cache_days', default=2)
-
 
 class PriceList(metaclass=PoolMeta):
     __name__ = 'product.price_list'
@@ -63,7 +60,8 @@ class PriceListCache(metaclass=PoolMeta):
         for pattern in super().patterns(price_list, product):
             if pattern is None:
                 pattern = {}
-            for days in range(_cache_days):
+            for days in range(config.getint(
+                        'product_price_list_dates', 'cache_days', default=2)):
                 pattern['date'] = today + dt.timedelta(days=days)
                 yield pattern
 
diff --git a/modules/sale_gift_card/sale.py b/modules/sale_gift_card/sale.py
index 35a0419b2a..1fee1058f1 100644
--- a/modules/sale_gift_card/sale.py
+++ b/modules/sale_gift_card/sale.py
@@ -5,7 +5,7 @@ from sql import Null
 from sql.functions import CharLength
 from sql.operators import Equal
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import Exclude, ModelSQL, ModelView, Workflow, fields
 from trytond.modules.company.model import CompanyValueMixin
diff --git a/modules/stock_package_shipping/stock.py b/modules/stock_package_shipping/stock.py
index 1d426eb5df..34651d9ef5 100644
--- a/modules/stock_package_shipping/stock.py
+++ b/modules/stock_package_shipping/stock.py
@@ -2,7 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 import mimetypes
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import ModelView, Workflow, fields
 from trytond.model.exceptions import AccessError
diff --git a/modules/stock_package_shipping_dpd/configuration.py b/modules/stock_package_shipping_dpd/configuration.py
index 07a38e994f..d323157610 100644
--- a/modules/stock_package_shipping_dpd/configuration.py
+++ b/modules/stock_package_shipping_dpd/configuration.py
@@ -5,7 +5,7 @@ from urllib.parse import urljoin
 from zeep import Client
 from zeep.transports import Transport
 
-from trytond.config import config
+import trytond.config as config
 
 SERVER_URLS = {
     'testing': 'https://public-ws-stage.dpd.com/services/',
@@ -14,17 +14,17 @@ SERVER_URLS = {
 
 LOGIN_SERVICE = 'LoginService/V2_0/?wsdl'
 SHIPMENT_SERVICE = 'ShipmentService/V3_2/?wsdl'
-TIMEOUT = config.get(
-    'stock_package_shipping_dpd', 'requests_timeout', default=300)
 
 
 def get_client(server, service):
     api_base_url = config.get('stock_package_shipping_dpd',
         server, default=SERVER_URLS[server])
     url = urljoin(api_base_url, service)
+    timeout = config.get(
+        'stock_package_shipping_dpd', 'requests_timeout', default=300)
     # Disable the cache for testing because zeep's bug
     # https://github.com/mvantellingen/python-zeep/issues/48
     # which makes testing environments fail
-    transport = (Transport(cache=None, operation_timeout=TIMEOUT)
+    transport = (Transport(cache=None, operation_timeout=timeout)
         if url.startswith(SERVER_URLS['testing']) else None)
     return Client(url, transport=transport)
diff --git a/modules/stock_package_shipping_mygls/api.py b/modules/stock_package_shipping_mygls/api.py
index 33e14ef77c..c9040c1b35 100644
--- a/modules/stock_package_shipping_mygls/api.py
+++ b/modules/stock_package_shipping_mygls/api.py
@@ -5,14 +5,12 @@ import hashlib
 from zeep import Client
 from zeep.transports import Transport
 
-from trytond.config import config
+import trytond.config as config
 
 URLS = {
     'testing': 'https://api.test.mygls.%(country)s/%(service)s.svc?singleWsdl',
     'production': 'https://api.mygls.%(country)s/%(service)s.svc?singleWsdl',
     }
-TIMEOUT = config.get(
-    'stock_package_shipping_mygls', 'requests_timeout', default=300)
 
 
 def get_client(credential, service):
@@ -20,7 +18,9 @@ def get_client(credential, service):
         'country': credential.country,
         'service': service,
         }
-    return Client(url, transport=Transport(operation_timeout=TIMEOUT))
+    timeout = config.get(
+        'stock_package_shipping_mygls', 'requests_timeout', default=300)
+    return Client(url, transport=Transport(operation_timeout=timeout))
 
 
 def get_request(credential, name, **kwargs):
diff --git a/modules/stock_package_shipping_sendcloud/carrier.py b/modules/stock_package_shipping_sendcloud/carrier.py
index 4e4e5c7f1b..db19a5f0a6 100644
--- a/modules/stock_package_shipping_sendcloud/carrier.py
+++ b/modules/stock_package_shipping_sendcloud/carrier.py
@@ -5,8 +5,8 @@ from functools import wraps
 
 import requests
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.i18n import gettext
 from trytond.model import (
     MatchMixin, ModelSQL, ModelView, fields, sequence_ordered)
@@ -17,8 +17,6 @@ from trytond.pyson import Eval, If
 from .exceptions import SendcloudCredentialWarning, SendcloudError
 
 SENDCLOUD_API_URL = 'https://panel.sendcloud.sc/api/v2/'
-TIMEOUT = config.getfloat(
-    'stock_package_shipping_sendcloud', 'requests_timeout', default=300)
 HEADERS = {
     'Sendcloud-Partner-Id': '03c1facb-63da-4bb1-889c-192fc91ec4e6',
     }
@@ -88,9 +86,12 @@ class CredentialSendcloud(sequence_ordered(), ModelSQL, ModelView, MatchMixin):
         addresses = self._addresses_sender_cache.get(self.id)
         if addresses is not None:
             return addresses
+        timeout = config.getfloat(
+            'stock_package_shipping_sendcloud', 'requests_timeout',
+            default=300)
         response = requests.get(
             SENDCLOUD_API_URL + 'user/addresses/sender',
-            auth=self.auth, timeout=TIMEOUT, headers=HEADERS)
+            auth=self.auth, timeout=timeout, headers=HEADERS)
         response.raise_for_status()
         addresses = response.json()['sender_addresses']
         self._addresses_sender_cache.set(self.id, addresses)
@@ -122,9 +123,12 @@ class CredentialSendcloud(sequence_ordered(), ModelSQL, ModelView, MatchMixin):
             params['service_point'] = service_point
         if is_return:
             params['is_return'] = is_return
+        timeout = config.getfloat(
+            'stock_package_shipping_sendcloud', 'requests_timeout',
+            default=300)
         response = requests.get(
             SENDCLOUD_API_URL + 'shipping_methods', params=params,
-            auth=self.auth, timeout=TIMEOUT, headers=HEADERS)
+            auth=self.auth, timeout=timeout, headers=HEADERS)
         response.raise_for_status()
         methods = response.json()['shipping_methods']
         self._shiping_methods_cache.set(key, methods)
@@ -159,17 +163,23 @@ class CredentialSendcloud(sequence_ordered(), ModelSQL, ModelView, MatchMixin):
 
     @sendcloud_api
     def get_parcel(self, id):
+        timeout = config.getfloat(
+            'stock_package_shipping_sendcloud', 'requests_timeout',
+            default=300)
         response = requests.get(
             SENDCLOUD_API_URL + 'parcels/%s' % id,
-            auth=self.auth, timeout=TIMEOUT, headers=HEADERS)
+            auth=self.auth, timeout=timeout, headers=HEADERS)
         response.raise_for_status()
         return response.json()['parcel']
 
     @sendcloud_api
     def create_parcels(self, parcels):
+        timeout = config.getfloat(
+            'stock_package_shipping_sendcloud', 'requests_timeout',
+            default=300)
         response = requests.post(
             SENDCLOUD_API_URL + 'parcels', json={'parcels': parcels},
-            auth=self.auth, timeout=TIMEOUT, headers=HEADERS)
+            auth=self.auth, timeout=timeout, headers=HEADERS)
         if response.status_code == 400:
             msg = response.json()['error']['message']
             raise requests.HTTPError(msg, response=response)
@@ -178,8 +188,11 @@ class CredentialSendcloud(sequence_ordered(), ModelSQL, ModelView, MatchMixin):
 
     @sendcloud_api
     def get_label(self, url):
+        timeout = config.getfloat(
+            'stock_package_shipping_sendcloud', 'requests_timeout',
+            default=300)
         response = requests.get(
-            url, auth=self.auth, timeout=TIMEOUT, headers=HEADERS)
+            url, auth=self.auth, timeout=timeout, headers=HEADERS)
         response.raise_for_status()
         return response.content
 
diff --git a/modules/stock_package_shipping_ups/stock.py b/modules/stock_package_shipping_ups/stock.py
index 8bd75e3fee..5233e4e167 100644
--- a/modules/stock_package_shipping_ups/stock.py
+++ b/modules/stock_package_shipping_ups/stock.py
@@ -10,7 +10,7 @@ from math import ceil
 
 import requests
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import fields
 from trytond.model.exceptions import AccessError
@@ -23,8 +23,6 @@ from trytond.wizard import StateAction, StateTransition, Wizard
 from .exceptions import UPSError
 
 TRACKING_URL = 'https://www.ups.com/track'
-TIMEOUT = config.getfloat(
-    'stock_package_shipping_ups', 'requests_timeout', default=300)
 
 
 class PackageType(metaclass=PoolMeta):
@@ -166,12 +164,14 @@ class CreateShippingUPS(Wizard):
             }
         nb_tries, response = 0, None
         error_message = ''
+        timeout = config.getfloat(
+            'stock_package_shipping_ups', 'requests_timeout', default=300)
         try:
             while nb_tries < 5 and response is None:
                 try:
                     response = requests.post(
                         api_url, json=shipment_request, headers=headers,
-                        timeout=TIMEOUT)
+                        timeout=timeout)
                 except ssl.SSLError as e:
                     error_message = e.reason
                     nb_tries += 1
diff --git a/modules/timesheet_cost/company.py b/modules/timesheet_cost/company.py
index 97a379cad3..57c2fc2dbd 100644
--- a/modules/timesheet_cost/company.py
+++ b/modules/timesheet_cost/company.py
@@ -2,8 +2,8 @@
 # this repository contains the full copyright notices and license terms.
 from decimal import Decimal
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.model import Index, ModelSQL, ModelView, Unique, fields
 from trytond.pool import Pool, PoolMeta
 from trytond.transaction import Transaction
diff --git a/modules/web_shop_product_data_feed/web.py b/modules/web_shop_product_data_feed/web.py
index e41d007f40..d6a8d96021 100644
--- a/modules/web_shop_product_data_feed/web.py
+++ b/modules/web_shop_product_data_feed/web.py
@@ -10,7 +10,7 @@ import time
 from functools import wraps
 from string import Template
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model import fields
 from trytond.pool import Pool, PoolMeta
 from trytond.transaction import Transaction
@@ -82,6 +82,8 @@ class Shop(metaclass=PoolMeta):
             shops = cls.search([])
 
         directory = _get_directory()
+        duration = config.getint(
+            'web_shop', 'product_data_feed_cache', default=60 * 60 * 24)
         for shop in shops:
             for name in fnmatch.filter(
                     os.listdir(directory),
@@ -92,13 +94,16 @@ class Shop(metaclass=PoolMeta):
                 else:
                     format, language = name, None
                 shop.product_data_feed_csv(
-                    format, language=language, duration=_duration / 2)
+                    format, language=language, duration=duration / 2)
 
-    def product_data_feed_csv(self, format, language=None, duration=_duration):
+    def product_data_feed_csv(self, format, language=None, duration=None):
         pool = Pool()
         Lang = pool.get('ir.lang')
         transaction = Transaction()
         directory = _get_directory()
+        if duration is None:
+            duration = config.getint(
+                'web_shop', 'product_data_feed_cache', default=60 * 60 * 24)
         if language:
             filename = f'{self.name}-{self.id}-{format}-{language}.csv'
         else:
diff --git a/modules/web_shop_shopify/web.py b/modules/web_shop_shopify/web.py
index 33f556e408..fcca8057c0 100644
--- a/modules/web_shop_shopify/web.py
+++ b/modules/web_shop_shopify/web.py
@@ -10,8 +10,8 @@ import pyactiveresource
 import shopify
 from shopify.api_version import ApiVersion
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.i18n import gettext
 from trytond.model import (
     MatchMixin, ModelSQL, ModelView, Unique, fields, sequence_ordered)
diff --git a/modules/web_shortener/web.py b/modules/web_shortener/web.py
index 8d3b357631..61bb60d9c0 100644
--- a/modules/web_shortener/web.py
+++ b/modules/web_shortener/web.py
@@ -7,7 +7,7 @@ from urllib.parse import quote, urljoin
 
 from sql.aggregate import Count
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model import ModelSQL, ModelView, fields
 from trytond.pool import Pool
 from trytond.tools import grouped_slice, reduce_ids
@@ -16,7 +16,6 @@ from trytond.url import http_host
 from trytond.wsgi import Base64Converter
 
 ALPHABET = string.digits + string.ascii_lowercase
-URL_BASE = config.get('web', 'shortener_base', default=http_host())
 logger = logging.getLogger(__name__)
 
 
@@ -38,10 +37,11 @@ class ShortenedURL(ModelSQL, ModelView):
             'database': Base64Converter(None).to_url(
                 Transaction().database.name),
             }
+        url_base = config.get('web', 'shortener_base', default=http_host())
         for shortened in shortened_urls:
             url_parts['short_id'] = cls._shorten(shortened.id)
             urls[shortened.id] = urljoin(
-                URL_BASE, quote('/s/%(database)s$%(short_id)s' % url_parts))
+                url_base, quote('/s/%(database)s$%(short_id)s' % url_parts))
         return urls
 
     @classmethod
diff --git a/modules/web_user/tests/test_module.py b/modules/web_user/tests/test_module.py
index 85de5726ce..4b53bd8778 100644
--- a/modules/web_user/tests/test_module.py
+++ b/modules/web_user/tests/test_module.py
@@ -3,7 +3,7 @@
 
 from unittest.mock import patch
 
-from trytond.config import config
+import trytond.config as config
 from trytond.modules.party.tests import PartyCheckEraseMixin
 from trytond.modules.web_user import user as user_module
 from trytond.pool import Pool
diff --git a/modules/web_user/user.py b/modules/web_user/user.py
index 13104d20bd..f0508c1021 100644
--- a/modules/web_user/user.py
+++ b/modules/web_user/user.py
@@ -20,7 +20,7 @@ from sql.conditionals import Coalesce
 from sql.functions import CurrentTimestamp
 from sql.operators import Equal
 
-from trytond.config import config
+import trytond.config as config
 from trytond.exceptions import RateLimitException
 from trytond.i18n import gettext
 from trytond.model import (
diff --git a/proteus/proteus/config.py b/proteus/proteus/config.py
index 45007ade37..dbaab9e6e6 100644
--- a/proteus/proteus/config.py
+++ b/proteus/proteus/config.py
@@ -264,7 +264,7 @@ class TrytondConfig(Config):
             os.environ['TRYTOND_DATABASE_URI'] = database
         if not config_file:
             config_file = os.environ.get('TRYTOND_CONFIG')
-        from trytond.config import config
+        import trytond.config as config
         config.update_etc(config_file)
         from trytond.pool import Pool
         from trytond.transaction import Transaction
diff --git a/trytond-gis/trytond_gis/__init__.py b/trytond-gis/trytond_gis/__init__.py
index 908fbabc58..a06fbd33ff 100644
--- a/trytond-gis/trytond_gis/__init__.py
+++ b/trytond-gis/trytond_gis/__init__.py
@@ -1,6 +1,6 @@
 # This file is part of trytond_gis.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.config import config
+import trytond.config as config
 
 from .const import WGS_84
 
diff --git a/trytond-gis/trytond_gis/postgis/table.py b/trytond-gis/trytond_gis/postgis/table.py
index b51fc5aeea..bbb1ea185c 100644
--- a/trytond-gis/trytond_gis/postgis/table.py
+++ b/trytond-gis/trytond_gis/postgis/table.py
@@ -2,8 +2,8 @@
 # this repository contains the full copyright notices and license terms.
 import logging
 
+import trytond.config as config
 from trytond.backend.postgresql.table import TableHandler as PGTableHandler
-from trytond.config import config
 from trytond.transaction import Transaction
 from trytond_gis.const import GIS_SQL_TYPE_RE, WGS_84
 
diff --git a/trytond/CHANGELOG b/trytond/CHANGELOG
index 0058ea2397..fb15bf2180 100644
--- a/trytond/CHANGELOG
+++ b/trytond/CHANGELOG
@@ -1,3 +1,4 @@
+* Refactor of trytond.config to add cache
 * Handle URL host of the bus on login
 * Restrict sessions to the client's IP address
 * Use ``tryton.cfg`` to register in the Pool
diff --git a/trytond/bin/trytond b/trytond/bin/trytond
index 3097f60118..3210d25e69 100755
--- a/trytond/bin/trytond
+++ b/trytond/bin/trytond
@@ -19,7 +19,7 @@ if os.path.isdir(DIR):
     sys.path.insert(0, os.path.dirname(DIR))
 
 import trytond.commandline as commandline
-from trytond.config import config, split_netloc
+import trytond.config as config
 
 parser = commandline.get_parser_daemon()
 if argcomplete:
@@ -47,7 +47,7 @@ with commandline.pidfile(options):
         threads.append(thread)
     for thread in threads:
         thread.join()
-    hostname, port = split_netloc(config.get('web', 'listen'))
+    hostname, port = config.split_netloc(config.get('web', 'listen'))
     certificate = config.get('ssl', 'certificate')
     try:
         if config.getboolean('ssl', 'certificate'):
diff --git a/trytond/bin/trytond-admin b/trytond/bin/trytond-admin
index 8ae76e1c07..cf660cafc3 100755
--- a/trytond/bin/trytond-admin
+++ b/trytond/bin/trytond-admin
@@ -16,7 +16,7 @@ if os.path.isdir(DIR):
     sys.path.insert(0, os.path.dirname(DIR))
 
 import trytond.commandline as commandline
-from trytond.config import config
+import trytond.config as config
 
 parser = commandline.get_parser_admin()
 if argcomplete:
diff --git a/trytond/bin/trytond-console b/trytond/bin/trytond-console
index 6ec5f00c84..1276a3344a 100755
--- a/trytond/bin/trytond-console
+++ b/trytond/bin/trytond-console
@@ -16,7 +16,7 @@ if os.path.isdir(DIR):
     sys.path.insert(0, os.path.dirname(DIR))
 
 import trytond.commandline as commandline
-from trytond.config import config
+import trytond.config as config
 
 parser = commandline.get_parser_console()
 if argcomplete:
diff --git a/trytond/bin/trytond-cron b/trytond/bin/trytond-cron
index d7e87760b2..91741d1e05 100755
--- a/trytond/bin/trytond-cron
+++ b/trytond/bin/trytond-cron
@@ -16,7 +16,7 @@ if os.path.isdir(DIR):
     sys.path.insert(0, os.path.dirname(DIR))
 
 import trytond.commandline as commandline
-from trytond.config import config
+import trytond.config as config
 
 parser = commandline.get_parser_cron()
 if argcomplete:
diff --git a/trytond/bin/trytond-stat b/trytond/bin/trytond-stat
index 528c296cee..ea390e80ed 100755
--- a/trytond/bin/trytond-stat
+++ b/trytond/bin/trytond-stat
@@ -20,7 +20,7 @@ if os.path.isdir(DIR):
     sys.path.insert(0, os.path.dirname(DIR))
 
 import trytond.commandline as commandline
-from trytond.config import config
+import trytond.config as config
 
 parser = commandline.get_parser_stat()
 if argcomplete:
diff --git a/trytond/bin/trytond-worker b/trytond/bin/trytond-worker
index 031816bc1e..48baa04415 100755
--- a/trytond/bin/trytond-worker
+++ b/trytond/bin/trytond-worker
@@ -16,7 +16,7 @@ if os.path.isdir(DIR):
     sys.path.insert(0, os.path.dirname(DIR))
 
 import trytond.commandline as commandline
-from trytond.config import config
+import trytond.config as config
 
 parser = commandline.get_parser_worker()
 if argcomplete:
diff --git a/trytond/doc/ref/config.rst b/trytond/doc/ref/config.rst
new file mode 100644
index 0000000000..f8f89ad433
--- /dev/null
+++ b/trytond/doc/ref/config.rst
@@ -0,0 +1,81 @@
+.. _ref-config:
+.. module:: trytond.config
+
+======
+Config
+======
+
+The config gives access to the configuration.
+
+.. contents::
+   :local:
+   :backlinks: entry
+   :depth: 1
+
+.. function:: get_hostname(netloc)
+
+   Returns the hostname from the network location/authority of :abbr:`URI
+   (Uniform Resource Identifier)`.
+
+.. function:: get_port(netloc)
+
+   Returns the port from the network location/authority of :abbr:`URI (Uniform
+   Resource Identifier)`.
+
+.. function:: split_netloc(netloc)
+
+   Returns the couple hostname and port from the network location/authority of
+   :abbr:`URI (Uniform Resource Identifier)`.
+
+.. function:: parse_listen(value)
+
+   Yields couples of hostname and port from the comma separated list of network
+   location/authority of :abbr:`URI (Uniform Resource Identifier)`.
+
+.. function:: parse_uri(uri)
+
+   Parses a :abbr:`URI (Uniform Resource Identifier)`, returning a namedtuple.
+
+.. function:: update_etc([configfile])
+
+   Tries to update the configuration with the file or list of files and returns
+   the filenames which were successfully parsed.
+
+.. function:: has_section(section)
+
+   Indicates whether the named section is present in the configuration.
+
+.. function:: add_section(section)
+
+   Adds the named section.
+
+.. function:: remove_section(section)
+
+   Removes the named section.
+
+.. function:: set(section, option[, value])
+
+   Set the given option to the specified value.
+
+.. function:: get(section, option[, default])
+
+   Get an option value for the named section. If the key is not found the
+   default value is provided.
+
+.. function:: getint(section, option[, default])
+
+   A convenience method which coerces the option in the specified section to an
+   :py:class:`int`.
+   See :func:`get`.
+
+.. function:: getfloat(section, option[, default])
+
+   A convenience method which coerces the option in the specified section to a
+   :py:class:`float`.
+   See :func:`get`.
+
+.. function:: getboolean(section, option[, default])
+
+   A convenience method which coerces the option in the specified section to a
+   :py:class:`bool`.
+   See :func:`get`.
diff --git a/trytond/doc/ref/index.rst b/trytond/doc/ref/index.rst
index ee1fd1cfd9..b34b634725 100644
--- a/trytond/doc/ref/index.rst
+++ b/trytond/doc/ref/index.rst
@@ -9,6 +9,7 @@ Reference of the ``trytond`` API:
 .. toctree::
    :maxdepth: 1
 
+   config
    models
    fields
    wizard
diff --git a/trytond/trytond/admin.py b/trytond/trytond/admin.py
index a6160426c4..b352af2834 100644
--- a/trytond/trytond/admin.py
+++ b/trytond/trytond/admin.py
@@ -8,8 +8,7 @@ from getpass import getpass
 
 from sql import Literal, Table
 
-from trytond import __series__, backend
-from trytond.config import config
+from trytond import __series__, backend, config
 from trytond.pool import Pool
 from trytond.sendmail import send_test_email
 from trytond.tools import file_open, find_path
diff --git a/trytond/trytond/backend/__init__.py b/trytond/trytond/backend/__init__.py
index 6dde7d5b99..3db79b28e2 100644
--- a/trytond/trytond/backend/__init__.py
+++ b/trytond/trytond/backend/__init__.py
@@ -8,7 +8,7 @@ try:
 except ImportError:
     from importlib.metadata import entry_points
 
-from trytond.config import config
+import trytond.config as config
 
 __all__ = [
     'name', 'Database', 'TableHandler',
diff --git a/trytond/trytond/backend/postgresql/database.py b/trytond/trytond/backend/postgresql/database.py
index 2692207d6a..f59b2cc9dc 100644
--- a/trytond/trytond/backend/postgresql/database.py
+++ b/trytond/trytond/backend/postgresql/database.py
@@ -36,9 +36,8 @@ from sql.conditionals import Coalesce
 from sql.functions import Function
 from sql.operators import BinaryOperator, Concat
 
-from trytond import __series__
+from trytond import __series__, config
 from trytond.backend.database import DatabaseInterface, SQLType
-from trytond.config import config, parse_uri
 from trytond.sql.operators import RangeOperator
 from trytond.tools import grouped_slice, reduce_ids
 from trytond.tools.gevent import is_gevent_monkey_patched
@@ -53,9 +52,6 @@ __all__ = [
 logger = logging.getLogger(__name__)
 
 os.environ['PGTZ'] = os.environ.get('TZ', '')
-_timeout = config.getint('database', 'timeout')
-_minconn = config.getint('database', 'minconn', default=1)
-_maxconn = config.getint('database', 'maxconn', default=64)
 _default_name = config.get('database', 'default_name', default='template1')
 
 
@@ -224,8 +220,9 @@ class Database(DatabaseInterface):
         with cls._lock:
             now = datetime.now()
             databases = cls._databases[os.getpid()]
+            timeout = config.getint('database', 'timeout')
             for database in list(databases.values()):
-                if ((now - database._last_use).total_seconds() > _timeout
+                if ((now - database._last_use).total_seconds() > timeout
                         and database.name != name
                         and not database._connpool._used):
                     database.close()
@@ -233,9 +230,11 @@ class Database(DatabaseInterface):
                 inst = databases[name]
             else:
                 inst = DatabaseInterface.__new__(cls, name=name)
+                minconn = config.getint('database', 'minconn', default=1)
+                maxconn = config.getint('database', 'maxconn', default=64)
                 try:
                     inst._connpool = ThreadedConnectionPool(
-                        _minconn, _maxconn, **cls._connection_params(name),
+                        minconn, maxconn, **cls._connection_params(name),
                         cursor_factory=LoggingCursor)
                 except Exception:
                     logger.error(
@@ -252,7 +251,7 @@ class Database(DatabaseInterface):
 
     @classmethod
     def _connection_params(cls, name):
-        uri = parse_uri(config.get('database', 'uri'))
+        uri = config.parse_uri(config.get('database', 'uri'))
         if uri.path and uri.path != '/':
             warnings.warn("The path specified in the URI will be overridden")
         params = {
@@ -267,7 +266,9 @@ class Database(DatabaseInterface):
 
     def get_connection(
             self, autocommit=False, readonly=False, statement_timeout=None):
-        retry = max(config.getint('database', 'retry'), _maxconn)
+        retry = max(
+            config.getint('database', 'retry'),
+            config.getint('database', 'maxconn', default=64))
         for count in range(retry, -1, -1):
             try:
                 conn = self._connpool.getconn()
diff --git a/trytond/trytond/backend/sqlite/database.py b/trytond/trytond/backend/sqlite/database.py
index c9a5c4a791..ddd92428a3 100644
--- a/trytond/trytond/backend/sqlite/database.py
+++ b/trytond/trytond/backend/sqlite/database.py
@@ -24,9 +24,8 @@ from sql.functions import (
     Substring, Trim)
 from sql.operators import Equal
 
-from trytond import __series__
+from trytond import __series__, config
 from trytond.backend.database import DatabaseInterface, SQLType
-from trytond.config import config, parse_uri
 from trytond.tools import safe_join
 from trytond.transaction import Transaction
 
@@ -539,7 +538,7 @@ class Database(DatabaseInterface):
 
     def _make_uri(self):
         uri = config.get('database', 'uri')
-        base_uri = parse_uri(uri)
+        base_uri = config.parse_uri(uri)
         if base_uri.path and base_uri.path != '/':
             warnings.warn("The path specified in the URI will be overridden")
 
diff --git a/trytond/trytond/bus.py b/trytond/trytond/bus.py
index 360e2299d1..32c606e4e5 100644
--- a/trytond/trytond/bus.py
+++ b/trytond/trytond/bus.py
@@ -10,8 +10,8 @@ import threading
 import time
 import uuid
 
+import trytond.config as config
 from trytond import backend
-from trytond.config import config
 from trytond.protocols.jsonrpc import JSONDecoder, JSONEncoder
 from trytond.protocols.wrappers import HTTPStatus, Response, abort, exceptions
 from trytond.tools import resolve
@@ -20,14 +20,6 @@ from trytond.wsgi import app
 
 logger = logging.getLogger(__name__)
 
-_db_timeout = config.getint('database', 'timeout')
-_cache_timeout = config.getint('bus', 'cache_timeout')
-_select_timeout = config.getint('bus', 'select_timeout')
-_long_polling_timeout = config.getint('bus', 'long_polling_timeout')
-_allow_subscribe = config.getboolean('bus', 'allow_subscribe')
-_url_host = config.get('bus', 'url_host')
-_web_cache_timeout = config.getint('web', 'cache_timeout')
-
 
 class _MessageQueue:
 
@@ -84,7 +76,8 @@ class LongPollingBus:
         pid = os.getpid()
         with cls._queues_lock[pid]:
             start_listener = (pid, database) not in cls._queues
-            cls._queues[pid, database]['timeout'] = time.time() + _db_timeout
+            cls._queues[pid, database]['timeout'] = (
+                time.time() + config.getint('database', 'timeout'))
             if start_listener:
                 listener = threading.Thread(
                     target=cls._listen, args=(database,), daemon=True)
@@ -106,7 +99,8 @@ class LongPollingBus:
                         'events'][channel]
                     event_channel.append(event)
 
-            triggered = event.wait(_long_polling_timeout)
+            triggered = event.wait(
+                config.getint('bus', 'long_polling_timeout'))
             if not triggered:
                 response = cls.create_response(None, None)
             else:
@@ -153,12 +147,13 @@ class LongPollingBus:
             cursor = conn.cursor()
             cursor.execute('LISTEN "%s"' % cls._channel)
 
-            cls._messages[database] = messages = _MessageQueue(_cache_timeout)
+            cls._messages[database] = messages = _MessageQueue(
+                config.getint('bus', 'cache_timeout'))
 
             now = time.time()
             selector.register(conn, selectors.EVENT_READ)
             while cls._queues[pid, database]['timeout'] > now:
-                selector.select(timeout=_select_timeout)
+                selector.select(timeout=config.getint('bus', 'select_timeout'))
                 conn.poll()
                 while conn.notifies:
                     notification = conn.notifies.pop()
@@ -226,9 +221,10 @@ else:
 @app.route('/<string:database_name>/bus', methods=['POST'])
 @app.session_valid
 def subscribe(request, database_name):
-    if not _allow_subscribe:
+    if not config.getboolean('bus', 'allow_subscribe'):
         raise exceptions.NotImplemented
-    if _url_host and _url_host != request.host_url:
+    url_host = config.get('bus', 'url_host')
+    if url_host and url_host != request.host_url:
         abort(HTTPStatus.UNAUTHORIZED)
     user = request.authorization.get('userid')
     channels = request.parsed_data.get('channels', [])
diff --git a/trytond/trytond/cache.py b/trytond/trytond/cache.py
index a5754ec0fc..7a5a72ed7c 100644
--- a/trytond/trytond/cache.py
+++ b/trytond/trytond/cache.py
@@ -14,17 +14,13 @@ from sql import Conflict, Table
 from sql.aggregate import Max
 from sql.functions import CurrentTimestamp, Function
 
-from trytond import backend
-from trytond.config import config
+from trytond import backend, config
 from trytond.pool import Pool
 from trytond.tools import grouped_slice, resolve
 from trytond.tools.multiprocessing import local
 from trytond.transaction import Transaction
 
 __all__ = ['BaseCache', 'Cache', 'LRUDict', 'LRUDictTransaction']
-_clean_timeout = config.getint('cache', 'clean_timeout')
-_select_timeout = config.getint('cache', 'select_timeout')
-_default_size_limit = config.getint('cache', 'default')
 logger = logging.getLogger(__name__)
 
 REFRESH_POOL_MSG = "refresh pool"
@@ -90,7 +86,7 @@ class BaseCache(object):
                 f" in regards to context ({context}).")
         self._name = name
         self.size_limit = config.getint(
-            'cache', name, default=_default_size_limit)
+            'cache', name, default=config.getint('cache', 'default'))
         self.context = context
         self.context_ignored_keys = set()
         if context and context_ignored_keys:
@@ -247,7 +243,8 @@ class MemoryCache(BaseCache):
 
         database = transaction.database
         dbname = database.name
-        if not _clean_timeout and database.has_channel():
+        clean_timeout = config.getint('cache', 'clean_timeout')
+        if not clean_timeout and database.has_channel():
             with cls._local.listener_lock:
                 if dbname not in cls._local.listeners:
                     listener = threading.Thread(
@@ -256,7 +253,7 @@ class MemoryCache(BaseCache):
                     listener.start()
             return
         last_clean = (dt.datetime.now() - cls._clean_last).total_seconds()
-        if last_clean < _clean_timeout:
+        if last_clean < clean_timeout:
             return
         connection = database.get_connection(readonly=True, autocommit=True)
         try:
@@ -292,7 +289,8 @@ class MemoryCache(BaseCache):
             return
         database = transaction.database
         dbname = database.name
-        if not _clean_timeout and transaction.database.has_channel():
+        clean_timeout = config.getint('cache', 'clean_timeout')
+        if not clean_timeout and transaction.database.has_channel():
             with transaction.connection.cursor() as cursor:
                 # The count computed as
                 # 8000 (max notify size) / 64 (max name data len)
@@ -379,7 +377,8 @@ class MemoryCache(BaseCache):
     def refresh_pool(cls, transaction):
         database = transaction.database
         dbname = database.name
-        if not _clean_timeout and database.has_channel():
+        clean_timeout = config.getint('cache', 'clean_timeout')
+        if not clean_timeout and database.has_channel():
             database = backend.Database(dbname)
             conn = database.get_connection()
             process_id = cls._local.portable_id
@@ -415,7 +414,8 @@ class MemoryCache(BaseCache):
 
             selector.register(conn, selectors.EVENT_READ)
             while cls._local.listeners.get(dbname) == current_thread:
-                selector.select(timeout=_select_timeout)
+                selector.select(
+                    timeout=config.getint('cache', 'select_timeout'))
                 conn.poll()
                 while conn.notifies:
                     notification = conn.notifies.pop()
diff --git a/trytond/trytond/commandline.py b/trytond/trytond/commandline.py
index 054ba6a087..17e9630b6f 100644
--- a/trytond/trytond/commandline.py
+++ b/trytond/trytond/commandline.py
@@ -16,7 +16,7 @@ logger = logging.getLogger(__name__)
 
 
 def database_completer(parsed_args, **kwargs):
-    from trytond.config import config
+    import trytond.config as config
     from trytond.transaction import Transaction
     config.update_etc(parsed_args.configfile)
     with Transaction().start(
diff --git a/trytond/trytond/config.py b/trytond/trytond/config.py
index c5cc9096a1..7d76212767 100644
--- a/trytond/trytond/config.py
+++ b/trytond/trytond/config.py
@@ -3,11 +3,17 @@
 import configparser
 import logging
 import os
+import sys
 import urllib.parse
+import warnings
+from functools import cache
 from getpass import getuser
 
-__all__ = ['config', 'get_hostname', 'get_port', 'split_netloc',
-    'parse_listen', 'parse_uri']
+__all__ = [
+    'get_hostname', 'get_port', 'split_netloc',
+    'parse_listen', 'parse_uri',
+    'update_etc', 'has_section', 'add_section', 'remove_section',
+    'set', 'get', 'getint', 'getfloat', 'getboolean']
 logger = logging.getLogger(__name__)
 
 # Needed so urlunsplit to always set netloc
@@ -135,40 +141,61 @@ class TrytonConfigParser(configparser.ConfigParser):
                 ','.join(set(configfile) - set(read_files)))
         return configfile
 
-    def get(self, section, option, *args, **kwargs):
-        default = kwargs.pop('default', None)
-        try:
-            return configparser.RawConfigParser.get(self, section, option,
-                *args, **kwargs)
-        except (configparser.NoOptionError, configparser.NoSectionError):
-            return default
 
-    def getint(self, section, option, *args, **kwargs):
-        default = kwargs.pop('default', None)
-        try:
-            return configparser.RawConfigParser.getint(self, section, option,
-                *args, **kwargs)
-        except (configparser.NoOptionError, configparser.NoSectionError,
-                TypeError):
-            return default
-
-    def getfloat(self, section, option, *args, **kwargs):
-        default = kwargs.pop('default', None)
-        try:
-            return configparser.RawConfigParser.getfloat(self, section, option,
-                *args, **kwargs)
-        except (configparser.NoOptionError, configparser.NoSectionError,
-                TypeError):
-            return default
-
-    def getboolean(self, section, option, *args, **kwargs):
-        default = kwargs.pop('default', None)
-        try:
-            return configparser.RawConfigParser.getboolean(
-                self, section, option, *args, **kwargs)
-        except (configparser.NoOptionError, configparser.NoSectionError,
-                AttributeError):
-            return default
+_config = TrytonConfigParser()
 
 
-config = TrytonConfigParser()
+def update_etc(configfile=os.environ.get('TRYTOND_CONFIG')):
+    configfile = _config.update_etc(configfile=configfile)
+    _cache_clear()
+    return configfile
+
+
+has_section = _config.has_section
+add_section = _config.add_section
+remove_section = _config.remove_section
+
+
+def set(section, option, value=None):
+    _config.set(section, option, value=value)
+    _cache_clear()
+
+
+@cache
+def get(section, option, default=None):
+    return configparser.RawConfigParser.get(
+        _config, section, option, fallback=default)
+
+
+def _cache_clear():
+    get.cache_clear()
+    getint.cache_clear()
+    getfloat.cache_clear()
+    getboolean.cache_clear()
+
+
+@cache
+def getint(section, option, default=None):
+    return configparser.RawConfigParser.getint(
+        _config, section, option, fallback=default)
+
+
+@cache
+def getfloat(section, option, default=None):
+    return configparser.RawConfigParser.getfloat(
+        _config, section, option, fallback=default)
+
+
+@cache
+def getboolean(section, option, default=None):
+    return configparser.RawConfigParser.getboolean(
+        _config, section, option, fallback=default)
+
+
+def __getattr__(name):
+    if name == 'config':
+        warnings.warn(
+            "trytond.config.config is deprecated, "
+            "use trytond.config", DeprecationWarning, stacklevel=2)
+        return sys.modules[__name__]
+    raise AttributeError(f"module {__name__} has no attribute {name}")
diff --git a/trytond/trytond/filestore.py b/trytond/trytond/filestore.py
index fa08aaca9b..26ef933023 100644
--- a/trytond/trytond/filestore.py
+++ b/trytond/trytond/filestore.py
@@ -2,13 +2,17 @@
 # this repository contains the full copyright notices and license terms.
 import hashlib
 import os
+from functools import cache
 
-from trytond.config import config
+import trytond.config as config
 from trytond.tools import resolve
 
 __all__ = ['filestore']
 
-PATH = os.path.normpath(config.get('database', 'path'))
+
+@cache
+def _normpath(path):
+    return os.path.normpath(path)
 
 
 class FileStore(object):
@@ -52,10 +56,15 @@ class FileStore(object):
     def setmany(self, data, prefix=''):
         return [self.set(d, prefix) for d in data]
 
+    @property
+    def path(self):
+        return _normpath(config.get('database', 'path'))
+
     def _filename(self, id, prefix):
-        filename = os.path.join(PATH, prefix, id[0:2], id[2:4], id)
+        path = self.path
+        filename = os.path.join(path, prefix, id[0:2], id[2:4], id)
         filename = os.path.normpath(filename)
-        if not filename.startswith(PATH):
+        if not filename.startswith(path):
             raise ValueError('Bad prefix')
         return filename
 
diff --git a/trytond/trytond/ir/attachment.py b/trytond/trytond/ir/attachment.py
index 2659116784..30e895ee06 100644
--- a/trytond/trytond/ir/attachment.py
+++ b/trytond/trytond/ir/attachment.py
@@ -1,6 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.config import config
+
+import trytond.config as config
 from trytond.i18n import lazy_gettext
 from trytond.model import ModelSQL, ModelView, fields
 from trytond.pool import Pool
diff --git a/trytond/trytond/ir/avatar.py b/trytond/trytond/ir/avatar.py
index 5576d14a74..9be29ad9e3 100644
--- a/trytond/trytond/ir/avatar.py
+++ b/trytond/trytond/ir/avatar.py
@@ -13,7 +13,7 @@ try:
 except ImportError:
     PIL = None
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import ModelSQL, Unique, fields
 from trytond.model.exceptions import ValidationError
@@ -29,7 +29,6 @@ if config.getboolean('database', 'avatar_filestore', default=False):
 else:
     file_id = None
     store_prefix = None
-URL_BASE = config.get('web', 'avatar_base', default='')
 FONT = os.path.join(os.path.dirname(__file__), 'fonts', 'karla.ttf')
 
 
@@ -89,8 +88,9 @@ class Avatar(ImageMixin, ResourceMixin, ModelSQL):
     @property
     def url(self):
         if self.image_id or self.image:
+            url_base = config.get('web', 'avatar_base', default='')
             return urljoin(
-                URL_BASE, quote('/avatar/%(database)s/%(uuid)s' % {
+                url_base, quote('/avatar/%(database)s/%(uuid)s' % {
                         'database': Base64Converter(None).to_url(
                             Transaction().database.name),
                         'uuid': self.uuid,
diff --git a/trytond/trytond/ir/configuration.py b/trytond/trytond/ir/configuration.py
index 5c3a8f26e1..a803a1a017 100644
--- a/trytond/trytond/ir/configuration.py
+++ b/trytond/trytond/ir/configuration.py
@@ -1,7 +1,8 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
+
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.model import ModelSingleton, ModelSQL, fields
 
 
diff --git a/trytond/trytond/ir/cron.py b/trytond/trytond/ir/cron.py
index 9c65852e14..ca84f534a9 100644
--- a/trytond/trytond/ir/cron.py
+++ b/trytond/trytond/ir/cron.py
@@ -11,8 +11,7 @@ from dateutil.relativedelta import relativedelta
 from sql import Literal
 from sql.conditionals import Coalesce
 
-from trytond import backend
-from trytond.config import config
+from trytond import backend, config
 from trytond.exceptions import UserError, UserWarning
 from trytond.model import (
     DeactivableMixin, Index, ModelSQL, ModelView, dualmethod, fields)
@@ -24,7 +23,6 @@ from trytond.tools import timezone as tz
 from trytond.transaction import Transaction, TransactionError
 from trytond.worker import run_task
 
-clean_days = config.getint('cron', 'clean_days', default=30)
 logger = logging.getLogger(__name__)
 
 
@@ -315,6 +313,7 @@ class Log(ModelSQL, ModelView):
     @classmethod
     def clean(cls, date=None):
         if date is None:
+            clean_days = config.getint('cron', 'clean_days', default=30)
             date = (
                 datetime.datetime.now() - datetime.timedelta(days=clean_days))
         logs = cls.search([('create_date', '<', date)])
diff --git a/trytond/trytond/ir/email_.py b/trytond/trytond/ir/email_.py
index 245a858834..d93e120eef 100644
--- a/trytond/trytond/ir/email_.py
+++ b/trytond/trytond/ir/email_.py
@@ -12,7 +12,7 @@ except ImportError:
     html2text = None
 from genshi.template import TextTemplate
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.model import EvalEnvironment, ModelSQL, ModelView, fields
 from trytond.model.exceptions import AccessError, ValidationError
diff --git a/trytond/trytond/ir/error.py b/trytond/trytond/ir/error.py
index b711ace0dc..db7b2c830c 100644
--- a/trytond/trytond/ir/error.py
+++ b/trytond/trytond/ir/error.py
@@ -5,7 +5,7 @@ import functools
 import logging
 import warnings
 
-from trytond.config import config
+import trytond.config as config
 from trytond.exceptions import UserError, UserWarning
 from trytond.model import (
     Index, ModelSQL, ModelView, Workflow, dualmethod, fields)
@@ -15,7 +15,6 @@ from trytond.tools import firstline
 from trytond.transaction import Transaction
 
 logger = logging.getLogger(__name__)
-clean_days = config.getint('error', 'clean_days', default=90)
 
 
 def set_user(field):
@@ -159,6 +158,7 @@ class Error(Workflow, ModelView, ModelSQL):
     @classmethod
     def clean(cls, date=None):
         if date is None:
+            clean_days = config.getint('error', 'clean_days', default=90)
             date = (
                 dt.datetime.now() - dt.timedelta(days=clean_days))
         errors = cls.search([('create_date', '<', date)])
diff --git a/trytond/trytond/ir/model.py b/trytond/trytond/ir/model.py
index 5b208532f0..f23aa25326 100644
--- a/trytond/trytond/ir/model.py
+++ b/trytond/trytond/ir/model.py
@@ -12,8 +12,8 @@ from sql.aggregate import Max
 from sql.conditionals import Case
 from sql.operators import Equal
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.i18n import gettext
 from trytond.model import (
     DeactivableMixin, EvalEnvironment, Exclude, Index, ModelSingleton,
@@ -32,7 +32,6 @@ from trytond.wizard import Button, StateAction, StateView, Wizard
 from .resource import ResourceAccessMixin
 
 logger = logging.getLogger(__name__)
-_request_timeout = config.getint('request', 'timeout', default=0)
 
 
 class ConditionError(ValidationError):
@@ -76,7 +75,8 @@ class Model(
                 'list_history': RPC(),
                 'get_notification': RPC(),
                 'get_names': RPC(),
-                'global_search': RPC(timeout=_request_timeout),
+                'global_search': RPC(
+                    timeout=config.getint('request', 'timeout', default=0)),
                 })
 
     @classmethod
diff --git a/trytond/trytond/ir/queue_.py b/trytond/trytond/ir/queue_.py
index 398f431cd5..5dfd64c1d3 100644
--- a/trytond/trytond/ir/queue_.py
+++ b/trytond/trytond/ir/queue_.py
@@ -6,17 +6,13 @@ from sql import Literal, Null, With
 from sql.aggregate import Min
 from sql.functions import CurrentTimestamp, Extract
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model import Index, ModelSQL, fields
 from trytond.pool import Pool
 from trytond.tools import grouped_slice
 from trytond.transaction import (
     Transaction, inactive_records, without_check_access)
 
-has_worker = config.getboolean('queue', 'worker', default=False)
-clean_days = config.getint('queue', 'clean_days', default=30)
-batch_size = config.getint('queue', 'batch_size', default=20)
-
 
 class Queue(ModelSQL):
     __name__ = 'ir.queue'
@@ -75,7 +71,7 @@ class Queue(ModelSQL):
                         }])
         if database.has_channel():
             cursor.execute('NOTIFY "%s"', (cls.__name__,))
-        if not has_worker:
+        if not config.getboolean('queue', 'worker', default=False):
             transaction.tasks.append(record.id)
         return record.id
 
@@ -185,7 +181,8 @@ class Queue(ModelSQL):
     def clean(cls, date=None):
         if date is None:
             date = (
-                datetime.datetime.now() - datetime.timedelta(days=clean_days))
+                datetime.datetime.now() - datetime.timedelta(
+                    days=config.getint('queue', 'clean_days', default=30)))
         tasks = cls.search(['OR',
                 ('dequeued_at', '<', date),
                 ('finished_at', '<', date),
@@ -215,6 +212,7 @@ class _Method(object):
     def __call__(self, instances, *args, **kwargs):
         transaction = Transaction()
         context = transaction.context.copy()
+        has_worker = config.getboolean('queue', 'worker', default=False)
         name = context.pop('queue_name', 'default')
         now = datetime.datetime.now()
         scheduled_at = context.pop('queue_scheduled_at', None)
@@ -248,7 +246,7 @@ class _Method(object):
         if isinstance(instances, list):
             if has_worker and queue_batch:
                 if isinstance(queue_batch, bool):
-                    count = batch_size
+                    count = config.getint('queue', 'batch_size', default=20)
                 else:
                     count = int(queue_batch)
             else:
diff --git a/trytond/trytond/ir/routes.py b/trytond/trytond/ir/routes.py
index ceeaad508f..0b7cbd9fe9 100644
--- a/trytond/trytond/ir/routes.py
+++ b/trytond/trytond/ir/routes.py
@@ -6,7 +6,7 @@ import io
 import json
 from numbers import Number
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext
 from trytond.protocols.jsonrpc import JSONDecoder
 from trytond.protocols.wrappers import (
@@ -15,14 +15,6 @@ from trytond.tools import slugify
 from trytond.transaction import Transaction
 from trytond.wsgi import app
 
-SOURCE = config.get(
-    'html', 'src',
-    default='https://cdn.tiny.cloud/1/no-api-key/tinymce/7/tinymce.min.js')
-LICENSE_KEY = config.get('html', 'license_key', default='gpl')
-AVATAR_TIMEOUT = config.getint(
-    'web', 'avatar_timeout', default=7 * 24 * 60 * 60)
-_request_timeout = config.getint('request', 'timeout', default=0)
-
 
 def get_token(record):
     return str((record.write_date or record.create_date).timestamp())
@@ -84,10 +76,14 @@ def html_editor(request, pool, model, record, field):
             'field': field.string,
             'title': request.args.get('title', "Tryton"),
             }
-
+        source = config.get(
+            'html', 'src',
+            default='https://cdn.tiny.cloud'
+            '/1/no-api-key/tinymce/7/tinymce.min.js')
+        license_key = config.get('html', 'license_key', default='gpl')
         return Response(TEMPLATE % {
-                'source': SOURCE,
-                'license_key': LICENSE_KEY,
+                'source': source,
+                'license_key': license_key,
                 'plugins': get_config(
                     ['plugins', model, field.name], default=''),
                 'css': get_config(
@@ -190,7 +186,8 @@ TEMPLATE = '''<!DOCTYPE html>
 @app.auth_required
 @with_pool
 @with_transaction(
-    user='request', context=dict(_check_access=True), timeout=_request_timeout)
+    user='request', context=dict(_check_access=True),
+    timeout=config.getint('request', 'timeout', default=0))
 def data(request, pool, model):
     User = pool.get('res.user')
     Lang = pool.get('ir.lang')
@@ -297,6 +294,7 @@ def avatar(request, pool, uuid):
         abort(HTTPStatus.BAD_REQUEST)
     response = Response(avatar.get(size), mimetype='image/jpeg')
     response.headers['Cache-Control'] = (
-        'max-age=%s, public' % AVATAR_TIMEOUT)
+        'max-age=%s, public' % config.getint(
+            'web', 'avatar_timeout', default=7 * 24 * 60 * 60))
     response.add_etag()
     return response
diff --git a/trytond/trytond/ir/session.py b/trytond/trytond/ir/session.py
index 01d73cfea7..ad50b1fcd8 100644
--- a/trytond/trytond/ir/session.py
+++ b/trytond/trytond/ir/session.py
@@ -4,15 +4,11 @@ import datetime
 import json
 from secrets import compare_digest, token_hex
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.model import Index, ModelSQL, fields
 from trytond.transaction import Transaction
 
-_session_timeout = datetime.timedelta(
-    seconds=config.getint('session', 'timeout'))
-_reset_interval = _session_timeout // 10
-
 
 class Session(ModelSQL):
     __name__ = 'ir.session'
@@ -135,8 +131,11 @@ class Session(ModelSQL):
         "Reset key session timestamp"
         now = datetime.datetime.now()
         last_reset = cls._session_reset_cache.get(key)
-        if last_reset is None or (now - _reset_interval) > last_reset:
-            timestamp = now - _session_timeout
+        session_timeout = datetime.timedelta(
+            seconds=config.getint('session', 'timeout'))
+        reset_interval = session_timeout // 10
+        if last_reset is None or (now - reset_interval) > last_reset:
+            timestamp = now - session_timeout
             sessions = cls.search([
                     ('key', '=', key),
                     ['OR',
diff --git a/trytond/trytond/ir/translation.py b/trytond/trytond/ir/translation.py
index eb60397ffe..77b564cfba 100644
--- a/trytond/trytond/ir/translation.py
+++ b/trytond/trytond/ir/translation.py
@@ -15,8 +15,8 @@ from sql.aggregate import Max
 from sql.conditionals import Case
 from sql.functions import Position, Substring
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.exceptions import UserError
 from trytond.i18n import gettext
 from trytond.model import Index, ModelSQL, ModelView, fields
diff --git a/trytond/trytond/model/dictschema.py b/trytond/trytond/model/dictschema.py
index 392dbd603c..b39d916502 100644
--- a/trytond/trytond/model/dictschema.py
+++ b/trytond/trytond/model/dictschema.py
@@ -3,8 +3,8 @@
 import json
 from collections import OrderedDict
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.i18n import gettext, lazy_gettext
 from trytond.model import fields
 from trytond.model.exceptions import ValidationError
@@ -14,9 +14,6 @@ from trytond.rpc import RPC
 from trytond.tools import slugify
 from trytond.transaction import Transaction
 
-_request_timeout = config.getint('request', 'timeout', default=0)
-_request_records_limit = config.getint('request', 'records_limit')
-
 
 class DomainError(ValidationError):
     pass
@@ -97,13 +94,13 @@ class DictSchemaMixin(object):
                 'get_keys': RPC(
                     instantiate=0,
                     size_limits={
-                        0: _request_records_limit,
+                        0: config.getint('request', 'records_limit'),
                         }),
                 'search_get_keys': RPC(
                     size_limits={
-                        1: _request_records_limit,
+                        1: config.getint('request', 'records_limit'),
                         },
-                    timeout=_request_timeout),
+                    timeout=config.getint('request', 'timeout', default=0)),
                 })
 
     @staticmethod
diff --git a/trytond/trytond/model/fields/many2one.py b/trytond/trytond/model/fields/many2one.py
index 646c5933c1..aa0d3234aa 100644
--- a/trytond/trytond/model/fields/many2one.py
+++ b/trytond/trytond/model/fields/many2one.py
@@ -10,7 +10,7 @@ from sql.conditionals import Coalesce
 from sql.functions import CharLength
 from sql.operators import Exists, Or
 
-from trytond.config import config
+import trytond.config as config
 from trytond.pool import Pool
 from trytond.pyson import PYSONEncoder
 from trytond.tools import cached_property, reduce_ids
@@ -20,8 +20,6 @@ from .field import (
     Field, context_validate, domain_method, instantiate_context, order_method,
     search_order_validate)
 
-_subquery_threshold = config.getint('database', 'subquery_threshold')
-
 
 class Many2One(Field):
     _type = 'many2one'
@@ -225,7 +223,8 @@ class Many2One(Field):
         pool = Pool()
         Rule = pool.get('ir.rule')
         Target = self.get_target()
-        use_subquery = Target.estimated_count() < _subquery_threshold
+        subquery_threshold = config.getint('database', 'subquery_threshold')
+        use_subquery = Target.estimated_count() < subquery_threshold
 
         table, _ = tables[None]
         name, operator, value = domain[:3]
diff --git a/trytond/trytond/model/fields/one2many.py b/trytond/trytond/model/fields/one2many.py
index 02d55c0c35..1c279da6ac 100644
--- a/trytond/trytond/model/fields/one2many.py
+++ b/trytond/trytond/model/fields/one2many.py
@@ -8,7 +8,7 @@ from sql import Literal
 from sql.conditionals import Coalesce
 from sql.operators import Exists
 
-from trytond.config import config
+import trytond.config as config
 from trytond.pool import Pool
 from trytond.pyson import PYSONEncoder
 from trytond.tools import cached_property, grouped_slice
@@ -19,8 +19,6 @@ from .field import (
     instanciate_values, instantiate_context, search_order_validate,
     size_validate)
 
-_subquery_threshold = config.getint('database', 'subquery_threshold')
-
 
 class One2Many(Field):
     _type = 'one2many'
@@ -347,7 +345,8 @@ class One2Many(Field):
             origin_where = origin.like(Model.__name__ + ',%')
             origin = origin_field.sql_id(origin, Target)
 
-        use_in = Target.estimated_count() < _subquery_threshold
+        subquery_threshold = config.getint('database', 'subquery_threshold')
+        use_in = Target.estimated_count() < subquery_threshold
         if '.' not in name:
             if value is None:
                 if use_in:
diff --git a/trytond/trytond/model/modelsql.py b/trytond/trytond/model/modelsql.py
index 4cfa48db07..acca5e62d6 100644
--- a/trytond/trytond/model/modelsql.py
+++ b/trytond/trytond/model/modelsql.py
@@ -13,9 +13,8 @@ from sql.conditionals import Coalesce
 from sql.functions import CurrentTimestamp, Extract, RowNumber, Substring
 from sql.operators import And, Concat, Equal, Exists, Operator, Or
 
-from trytond import backend
+from trytond import backend, config
 from trytond.cache import freeze
-from trytond.config import config
 from trytond.exceptions import ConcurrencyException
 from trytond.i18n import gettext
 from trytond.pool import Pool
@@ -34,8 +33,6 @@ from .modelstorage import (
     ValidationError, is_leaf)
 from .modelview import ModelView
 
-_request_records_limit = config.getint('request', 'records_limit')
-
 
 class ForeignKeyError(ValidationError):
     pass
@@ -356,7 +353,7 @@ class ModelSQL(ModelStorage):
             cls.__rpc__.update({
                     'history_revisions': RPC(
                         size_limits={
-                            0: _request_records_limit,
+                            0: config.getint('request', 'records_limit'),
                             }),
                     })
         if cls._history:
diff --git a/trytond/trytond/model/modelstorage.py b/trytond/trytond/model/modelstorage.py
index ba755438c4..dc396db123 100644
--- a/trytond/trytond/model/modelstorage.py
+++ b/trytond/trytond/model/modelstorage.py
@@ -16,8 +16,8 @@ from io import StringIO
 from itertools import chain, groupby, islice
 from operator import itemgetter
 
+import trytond.config as config
 from trytond.cache import Cache, LRUDictTransaction, freeze, unfreeze
-from trytond.config import config
 from trytond.const import OPERATORS
 from trytond.exceptions import UserError
 from trytond.i18n import gettext, lazy_gettext
@@ -36,13 +36,6 @@ from .descriptors import dualmethod
 from .model import Model
 
 __all__ = ['ModelStorage', 'EvalEnvironment']
-_cache_field = config.getint('cache', 'field')
-_cache_count_timeout = config.getint(
-    'cache', 'count_timeout', default=60 * 60 * 24)
-_cache_count_clear = config.getint(
-    'cache', 'count_clear', default=1000)
-_request_timeout = config.getint('request', 'timeout', default=0)
-_request_records_limit = config.getint('request', 'records_limit')
 
 
 def local_cache(Model, transaction=None):
@@ -125,7 +118,10 @@ class ModelStorage(Model):
     xml_id = fields.Function(
         fields.Char(lazy_gettext('ir.msg_xml_id')), 'get_xml_id')
     _count_cache = Cache(
-        'modelstorage.count', duration=_cache_count_timeout, context=False)
+        'modelstorage.count',
+        duration=config.getint(
+            'cache', 'count_timeout', default=60 * 60 * 24),
+        context=False)
     _log = None
 
     @classmethod
@@ -133,74 +129,76 @@ class ModelStorage(Model):
         from .modelview import ModelView
         super().__setup__()
         if issubclass(cls, ModelView):
+            request_timeout = config.getint('request', 'timeout', default=0)
+            request_records_limit = config.getint('request', 'records_limit')
             cls.__rpc__.update({
                     'create': RPC(
                         readonly=False,
                         size_limits={
-                            0: _request_records_limit,
+                            0: request_records_limit,
                             },
                         result=lambda r: list(map(int, r))),
                     'read': RPC(
-                        timeout=_request_timeout,
+                        timeout=request_timeout,
                         size_limits={
-                            0: _request_records_limit,
+                            0: request_records_limit,
                             }),
                     'write': RPC(
                         readonly=False,
                         instantiate=slice(0, None, 2),
                         size_limits={
-                            (0, None, 2): _request_records_limit,
+                            (0, None, 2): request_records_limit,
                             }),
                     'delete': RPC(
                         readonly=False,
                         instantiate=0,
                         size_limits={
-                            (0, None, 2): _request_records_limit,
+                            (0, None, 2): request_records_limit,
                             }),
                     'copy': RPC(
                         readonly=False,
                         instantiate=0,
                         unique=False,
                         size_limits={
-                            0: _request_records_limit,
+                            0: request_records_limit,
                             },
                         result=lambda r: list(map(int, r))),
                     'search': RPC(
                         result=lambda r: list(map(int, r)),
                         size_limits={
-                            2: _request_records_limit,
+                            2: request_records_limit,
                             },
-                        timeout=_request_timeout),
+                        timeout=request_timeout),
                     'search_count': RPC(
-                        timeout=_request_timeout,
+                        timeout=request_timeout,
                         size_limits={
-                            2: _request_records_limit,
+                            2: request_records_limit,
                             }),
                     'search_read': RPC(
-                        timeout=_request_timeout,
+                        timeout=request_timeout,
                         size_limits={
-                            2: _request_records_limit,
+                            2: request_records_limit,
                             }),
                     'resources': RPC(
                         instantiate=0,
                         unique=False,
-                        timeout=_request_timeout),
+                        timeout=request_timeout),
                     'export_data_domain': RPC(
-                        timeout=_request_timeout,
+                        timeout=request_timeout,
                         size_limits={
-                            4: _request_records_limit,
+                            4: request_records_limit,
                             }),
                     'export_data': RPC(
                         instantiate=0,
                         unique=False,
                         size_limits={
-                            0: _request_records_limit,
+                            0: request_records_limit,
                             },
-                        timeout=_request_timeout),
+                        timeout=request_timeout),
                     'import_data': RPC(
                         readonly=False,
                         size_limits={
-                            1: _request_records_limit,
+                            1: request_records_limit,
                             }),
                     })
         if cls._log is None:
@@ -267,7 +265,8 @@ class ModelStorage(Model):
 
         count = cls._count_cache.get(cls.__name__)
         if count is not None:
-            if random.random() < 1 / _cache_count_clear:
+            if random.random() < 1 / config.getint(
+                    'cache', 'count_clear', default=1000):
                 cls._count_cache.set(cls.__name__, None)
             else:
                 cls._count_cache.set(cls.__name__, count + len(vlist))
@@ -464,7 +463,8 @@ class ModelStorage(Model):
 
         count = cls._count_cache.get(cls.__name__)
         if count is not None:
-            if random.random() < 1 / _cache_count_clear:
+            if random.random() < 1 / config.getint(
+                    'cache', 'count_clear', default=1000):
                 cls._count_cache.set(cls.__name__, None)
             else:
                 cls._count_cache.set(cls.__name__, count - len(records))
@@ -1889,7 +1889,7 @@ class ModelStorage(Model):
             ifields = filter(to_load,
                 filter(not_cached,
                     iter(self._fields.items())))
-            ifields = islice(ifields, 0, _cache_field)
+            ifields = islice(ifields, 0, config.getint('cache', 'field'))
             ffields.update(ifields)
 
         # add datetime_field
diff --git a/trytond/trytond/model/modelview.py b/trytond/trytond/model/modelview.py
index a383ec4d09..ee49fe0673 100644
--- a/trytond/trytond/model/modelview.py
+++ b/trytond/trytond/model/modelview.py
@@ -5,8 +5,8 @@ from functools import wraps
 
 from lxml import etree
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.exceptions import UserError
 from trytond.i18n import gettext
 from trytond.pool import Pool
@@ -21,7 +21,6 @@ from .fields.field import _set_value
 from .model import Model
 
 __all__ = ['ModelView']
-_request_records_limit = config.getint('request', 'records_limit')
 
 
 class AccessButtonError(UserError):
@@ -102,7 +101,7 @@ class ModelView(Model):
                     instantiate=0, result=on_change_result),
                 'autocomplete': RPC(
                     size_limits={
-                        2: _request_records_limit,
+                        2: config.getint('request', 'records_limit'),
                         }),
                 })
         cls._buttons = {}
diff --git a/trytond/trytond/modules/__init__.py b/trytond/trytond/modules/__init__.py
index 1e9ff0b88e..60306cd38b 100644
--- a/trytond/trytond/modules/__init__.py
+++ b/trytond/trytond/modules/__init__.py
@@ -13,10 +13,7 @@ from glob import iglob
 from sql import Table
 from sql.functions import CurrentTimestamp
 
-import trytond.convert as convert
-import trytond.tools as tools
-from trytond import __series__
-from trytond.config import config
+from trytond import __series__, config, convert, tools
 from trytond.const import MODULES_GROUP
 from trytond.exceptions import MissingDependenciesException
 from trytond.transaction import Transaction
diff --git a/trytond/trytond/protocols/dispatcher.py b/trytond/trytond/protocols/dispatcher.py
index 4d97bf5897..70290ed5bd 100644
--- a/trytond/trytond/protocols/dispatcher.py
+++ b/trytond/trytond/protocols/dispatcher.py
@@ -7,8 +7,7 @@ import time
 
 from sql import Table
 
-from trytond import __series__, backend, security
-from trytond.config import config, get_hostname
+from trytond import __series__, backend, config, security
 from trytond.exceptions import (
     ConcurrencyException, LoginException, RateLimitException, UserError,
     UserWarning)
@@ -122,7 +121,7 @@ def db_list(request, *args):
     if not config.getboolean('database', 'list'):
         abort(HTTPStatus.FORBIDDEN)
     context = {'_request': request.context}
-    hostname = get_hostname(request.host)
+    hostname = config.get_hostname(request.host)
     with Transaction().start(
             None, 0, context=context, readonly=True, close=True,
             ) as transaction:
diff --git a/trytond/trytond/protocols/wrappers.py b/trytond/trytond/protocols/wrappers.py
index 9b3cd99e03..a5c90edfea 100644
--- a/trytond/trytond/protocols/wrappers.py
+++ b/trytond/trytond/protocols/wrappers.py
@@ -18,8 +18,7 @@ from werkzeug.utils import redirect, send_file
 from werkzeug.wrappers import Request as _Request
 from werkzeug.wrappers import Response
 
-from trytond import backend, security
-from trytond.config import config, get_hostname
+from trytond import backend, config, security
 from trytond.exceptions import RateLimitException, UserError, UserWarning
 from trytond.pool import Pool
 from trytond.tools import cached_property
@@ -193,7 +192,7 @@ def with_pool(func):
         database_list = Pool.database_list()
         if database_name not in database_list:
             with Transaction().start(None, 0, readonly=True) as transaction:
-                hostname = get_hostname(request.host)
+                hostname = config.get_hostname(request.host)
                 db_list = transaction.database.list(hostname=hostname)
                 if database_name not in db_list:
                     abort(HTTPStatus.NOT_FOUND)
diff --git a/trytond/trytond/report/report.py b/trytond/trytond/report/report.py
index dd461c98fd..136aa76ae0 100644
--- a/trytond/trytond/report/report.py
+++ b/trytond/trytond/report/report.py
@@ -35,7 +35,7 @@ except ImportError:
 from genshi.filters import Translator
 from genshi.template.text import TextTemplate
 
-from trytond.config import config
+import trytond.config as config
 from trytond.i18n import gettext, ngettext
 from trytond.model.exceptions import AccessError
 from trytond.pool import Pool, PoolBase
@@ -115,13 +115,6 @@ NO_BREAKING_SPACE = '\u00A0'
 # round it to 100.
 REPORT_NAME_MAX_LENGTH = 100
 
-CONVERT_COMMAND = config.get(
-    'report', 'convert_command',
-    default='soffice --headless --nolockcheck --nodefault --norestore '
-    '--convert-to "%(output_extension)s" '
-    '--outdir "%(directory)s" '
-    '"%(input_path)s"')
-
 
 class TranslateFactory:
 
@@ -434,7 +427,14 @@ class Report(URLMixin, PoolBase):
         with open(input_path, mode) as fp:
             fp.write(data)
         try:
-            cmd = CONVERT_COMMAND % {
+            cmd = config.get(
+                'report', 'convert_command',
+                default='soffice --headless '
+                '--nolockcheck --nodefault --norestore '
+                '--convert-to "%(output_extension)s" '
+                '--outdir "%(directory)s" '
+                '"%(input_path)s"')
+            cmd %= {
                 'directory': directory,
                 'input_format': input_format,
                 'input_extension': input_extension,
diff --git a/trytond/trytond/res/routes.py b/trytond/trytond/res/routes.py
index a9064c042b..00410c5db0 100644
--- a/trytond/trytond/res/routes.py
+++ b/trytond/trytond/res/routes.py
@@ -4,7 +4,7 @@ import logging
 import random
 import time
 
-from trytond.config import config
+import trytond.config as config
 from trytond.protocols.wrappers import (
     abort, allow_null_origin, with_pool, with_transaction)
 from trytond.transaction import Transaction
diff --git a/trytond/trytond/res/user.py b/trytond/trytond/res/user.py
index ba153b1ae9..fc35b6a70d 100644
--- a/trytond/trytond/res/user.py
+++ b/trytond/trytond/res/user.py
@@ -30,8 +30,8 @@ from sql.aggregate import Count
 from sql.conditionals import Case
 from sql.functions import CurrentTimestamp
 
+import trytond.config as config
 from trytond.cache import Cache
-from trytond.config import config
 from trytond.exceptions import LoginException, RateLimitException, UserError
 from trytond.i18n import gettext, ngettext
 from trytond.model import (
diff --git a/trytond/trytond/security.py b/trytond/trytond/security.py
index 6fe0eea9f0..1e239199f9 100644
--- a/trytond/trytond/security.py
+++ b/trytond/trytond/security.py
@@ -16,8 +16,7 @@ from sql import Table
 from sql.conditionals import Coalesce
 from werkzeug.exceptions import abort
 
-from trytond import backend
-from trytond.config import config
+from trytond import backend, config
 from trytond.exceptions import LoginException, RateLimitException
 from trytond.pool import Pool
 from trytond.transaction import Transaction
diff --git a/trytond/trytond/sendmail.py b/trytond/trytond/sendmail.py
index b0f416db54..46fe7c1f90 100644
--- a/trytond/trytond/sendmail.py
+++ b/trytond/trytond/sendmail.py
@@ -8,7 +8,7 @@ from email.message import EmailMessage, Message
 from email.utils import formatdate, make_msgid
 from urllib.parse import parse_qs, unquote_plus
 
-from trytond.config import config, parse_uri
+import trytond.config as config
 from trytond.transaction import Transaction
 from trytond.url import host
 
@@ -17,7 +17,6 @@ __all__ = [
     'send_message_transactional', 'send_message',
     'SMTPDataManager']
 logger = logging.getLogger(__name__)
-retry = config.getint('email', 'retry', default=5)
 
 
 def sendmail_transactional(
@@ -59,6 +58,7 @@ def send_message(
         quit = False
     if 'Date' not in msg:
         msg['Date'] = formatdate()
+    retry = config.getint('email', 'retry', default=5)
     for count in range(retry, -1, -1):
         if count != retry:
             time.sleep(0.02 * (retry - count))
@@ -110,7 +110,7 @@ def get_smtp_server(uri=None, strict=False):
     if uri is None:
         uri = config.get('email', 'uri')
     ini_uri = uri
-    uri = parse_uri(uri)
+    uri = config.parse_uri(uri)
     extra = {}
     if uri.query:
         cast = {'timeout': int}
diff --git a/trytond/trytond/status.py b/trytond/trytond/status.py
index 690b8b5a9d..4b243208f3 100644
--- a/trytond/trytond/status.py
+++ b/trytond/trytond/status.py
@@ -10,7 +10,7 @@ import time
 from collections import namedtuple
 from contextlib import contextmanager
 
-from trytond.config import config
+import trytond.config as config
 
 status = dict()
 logger = logging.getLogger(__name__)
diff --git a/trytond/trytond/tests/test_bus.py b/trytond/trytond/tests/test_bus.py
index c7a7d12347..171a4208f1 100644
--- a/trytond/trytond/tests/test_bus.py
+++ b/trytond/trytond/tests/test_bus.py
@@ -5,7 +5,7 @@ import time
 import unittest
 from unittest.mock import patch
 
-from trytond import backend, bus
+from trytond import backend, config
 from trytond.bus import Bus, _MessageQueue, notify
 from trytond.tests.test_tryton import (
     DB_NAME, TestCase, activate_module, with_transaction)
@@ -85,15 +85,15 @@ class BusTestCase(TestCase):
     def setUp(self):
         super().setUp()
 
-        reset_polling_timeout = bus._long_polling_timeout
-        bus._long_polling_timeout = 1
+        polling_timeout = config.get('bus', 'long_polling_timeout')
+        config.set('bus', 'long_polling_timeout', '1')
         self.addCleanup(
-            setattr, bus, '_long_polling_timeout', reset_polling_timeout)
+            config.set, 'bus', 'long_polling_timeout', polling_timeout)
 
-        reset_select_timeout = bus._select_timeout
-        bus._select_timeout = 1
+        select_timeout = config.get('bus', 'select_timeout')
+        config.set('bus', 'select_timeout', '1')
         self.addCleanup(
-            setattr, bus, '_select_timeout', reset_select_timeout)
+            config.set, 'bus', 'select_timeout', select_timeout)
 
     def tearDown(self):
         pid = os.getpid()
diff --git a/trytond/trytond/tests/test_cache.py b/trytond/trytond/tests/test_cache.py
index 552d694d22..d2356ecc9b 100644
--- a/trytond/trytond/tests/test_cache.py
+++ b/trytond/trytond/tests/test_cache.py
@@ -6,8 +6,7 @@ import time
 import unittest
 from unittest.mock import patch
 
-from trytond import backend
-from trytond import cache as cache_mod
+from trytond import backend, config
 from trytond.cache import (
     LRUDict, LRUDictTransaction, MemoryCache, freeze, unfreeze)
 from trytond.tests.test_tryton import (
@@ -106,10 +105,10 @@ class MemoryCacheTestCase(TestCase):
 
     def setUp(self):
         super().setUp()
-        clear_timeout = cache_mod._clean_timeout
-        cache_mod._clean_timeout = 1
+        clean_timeout = config.get('cache', 'clean_timeout')
+        config.set('cache', 'clean_timeout', '1')
         self.addCleanup(
-            setattr, cache_mod, '_clean_timeout', clear_timeout)
+            config.set, 'cache', 'clean_timeout', clean_timeout)
 
     def tearDown(self):
         MemoryCache.drop(DB_NAME)
@@ -176,7 +175,7 @@ class MemoryCacheTestCase(TestCase):
         with Transaction().start(DB_NAME, USER):
             cache.clear()
         # Ensure sync is performed on start
-        time.sleep(cache_mod._clean_timeout)
+        time.sleep(config.getint('cache', 'clean_timeout'))
 
         with Transaction().start(DB_NAME, USER) as transaction1:
             cache.clear()
@@ -187,7 +186,7 @@ class MemoryCacheTestCase(TestCase):
         "Test MemoryCache synchronisation"
         with Transaction().start(DB_NAME, USER):
             cache.clear()
-        time.sleep(cache_mod._clean_timeout)
+        time.sleep(config.getint('cache', 'clean_timeout'))
         last = cache._clean_last
 
         with Transaction().start(DB_NAME, USER):
@@ -243,10 +242,10 @@ class MemoryCacheChannelTestCase(MemoryCacheTestCase):
 
     def setUp(self):
         super().setUp()
-        clear_timeout = cache_mod._clean_timeout
-        cache_mod._clean_timeout = 0
+        clean_timeout = config.get('cache', 'clean_timeout')
+        config.set('cache', 'clean_timeout', '0')
         self.addCleanup(
-            setattr, cache_mod, '_clean_timeout', clear_timeout)
+            config.set, 'cache', 'clean_timeout', clean_timeout)
 
     def wait_cache_sync(self, after=None):
         if after is None:
diff --git a/trytond/trytond/tests/test_field_binary.py b/trytond/trytond/tests/test_field_binary.py
index 3b0a8b6e2c..7dc03ea0cc 100644
--- a/trytond/trytond/tests/test_field_binary.py
+++ b/trytond/trytond/tests/test_field_binary.py
@@ -5,7 +5,7 @@ import tempfile
 
 from sql import Literal
 
-from trytond import filestore
+from trytond import config
 from trytond.model import fields
 from trytond.model.exceptions import (
     RequiredValidationError, SQLConstraintError)
@@ -27,10 +27,10 @@ class FieldBinaryTestCase(TestCase):
 
     def setUp(self):
         super().setUp()
-        path = filestore.PATH
+        path = config.get('database', 'path')
         dtemp = tempfile.mkdtemp()
-        filestore.PATH = dtemp
-        self.addCleanup(setattr, filestore, 'PATH', path)
+        config.set('database', 'path', dtemp)
+        self.addCleanup(config.set, 'database', 'path', path)
         self.addCleanup(shutil.rmtree, dtemp)
 
     @with_transaction()
diff --git a/trytond/trytond/tests/test_field_many2one.py b/trytond/trytond/tests/test_field_many2one.py
index ac723cb09c..6e5e27e94d 100644
--- a/trytond/trytond/tests/test_field_many2one.py
+++ b/trytond/trytond/tests/test_field_many2one.py
@@ -5,7 +5,7 @@ from unittest.mock import patch
 
 from sql import Join, Table
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model.exceptions import DomainValidationError
 from trytond.pool import Pool
 from trytond.tests.test_tryton import (
@@ -354,12 +354,10 @@ class FieldMany2OneExistsTestCase(
         activate_module('tests')
 
     def setUp(self):
-        from trytond.model.fields import many2one
         super().setUp()
-        previous = int(
-            config.get('database', 'subquery_threshold', default='1_000'))
-        many2one._subquery_threshold = 0
-        self.addCleanup(setattr, many2one, '_subquery_threshold', previous)
+        previous = config.get('database', 'subquery_threshold')
+        config.set('database', 'subquery_threshold', '0')
+        self.addCleanup(config.set, 'database', 'subquery_threshold', previous)
 
 
 class FieldMany2OneTreeTestCase(TestCase):
diff --git a/trytond/trytond/tests/test_field_one2many.py b/trytond/trytond/tests/test_field_one2many.py
index 8cb118c901..59804b3873 100644
--- a/trytond/trytond/tests/test_field_one2many.py
+++ b/trytond/trytond/tests/test_field_one2many.py
@@ -1,7 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 
-from trytond.config import config
+import trytond.config as config
 from trytond.model.exceptions import (
     DomainValidationError, RequiredValidationError, SizeValidationError)
 from trytond.pool import Pool
@@ -746,12 +746,10 @@ class FieldOne2ManyExistsTestCase(TestCase, SearchTestCaseMixin):
         activate_module('tests')
 
     def setUp(self):
-        from trytond.model.fields import one2many
         super().setUp()
-        previous = int(
-            config.get('database', 'subquery_threshold', default='1_000'))
-        one2many._subquery_threshold = 0
-        self.addCleanup(setattr, one2many, '_subquery_threshold', previous)
+        previous = config.get('database', 'subquery_threshold')
+        config.set('database', 'subquery_threshold', '0')
+        self.addCleanup(config.set, 'database', 'subquery_threshold', previous)
 
     def One2Many(self):
         return Pool().get('test.one2many')
@@ -771,12 +769,10 @@ class FieldOne2ManyReferenceExistsTestCase(
         activate_module('tests')
 
     def setUp(self):
-        from trytond.model.fields import one2many
         super().setUp()
-        previous = int(
-            config.get('database', 'subquery_threshold', default='1_000'))
-        one2many._subquery_threshold = 0
-        self.addCleanup(setattr, one2many, '_subquery_threshold', previous)
+        previous = config.get('database', 'subquery_threshold')
+        config.set('database', 'subquery_threshold', '0')
+        self.addCleanup(config.set, 'database', 'subquery_threshold', previous)
 
     def One2Many(self):
         return Pool().get('test.one2many_reference')
diff --git a/trytond/trytond/tests/test_filestore.py b/trytond/trytond/tests/test_filestore.py
index 382b6134bf..342cc771fc 100644
--- a/trytond/trytond/tests/test_filestore.py
+++ b/trytond/trytond/tests/test_filestore.py
@@ -5,7 +5,7 @@ import shutil
 import tempfile
 from unittest.mock import patch
 
-from trytond.config import config
+import trytond.config as config
 from trytond.filestore import filestore
 from trytond.tests.test_tryton import TestCase
 
@@ -17,10 +17,7 @@ class FileStoreTestCase(TestCase):
         path = config.get('database', 'path')
         dtemp = tempfile.mkdtemp()
         config.set('database', 'path', dtemp)
-        patcher = patch('trytond.filestore.PATH', dtemp)
-        patcher.start()
         self.addCleanup(config.set, 'database', 'path', path)
-        self.addCleanup(patcher.stop)
         self.addCleanup(shutil.rmtree, dtemp)
 
     def data(self):
diff --git a/trytond/trytond/tests/test_tryton.py b/trytond/trytond/tests/test_tryton.py
index b280527594..63ba0d0fa0 100644
--- a/trytond/trytond/tests/test_tryton.py
+++ b/trytond/trytond/tests/test_tryton.py
@@ -27,9 +27,8 @@ from lxml import etree
 from sql import Table
 from werkzeug.test import Client
 
-from trytond import backend
+from trytond import backend, config
 from trytond.cache import Cache
-from trytond.config import config, parse_uri
 from trytond.model import (
     ModelSingleton, ModelSQL, ModelStorage, ModelView, Workflow, fields)
 from trytond.model.fields import Function
@@ -188,7 +187,7 @@ def _sqlite_copy(file_, restore=False):
 
 
 def _pg_options():
-    uri = parse_uri(config.get('database', 'uri'))
+    uri = config.parse_uri(config.get('database', 'uri'))
     options = []
     env = os.environ.copy()
     if uri.hostname:
diff --git a/trytond/trytond/tests/test_user.py b/trytond/trytond/tests/test_user.py
index 4856bcc4c3..e888738cde 100644
--- a/trytond/trytond/tests/test_user.py
+++ b/trytond/trytond/tests/test_user.py
@@ -5,7 +5,7 @@ import os
 from contextlib import contextmanager
 from unittest.mock import Mock, patch
 
-from trytond.config import config
+import trytond.config as config
 from trytond.pool import Pool
 from trytond.res import user as user_module
 from trytond.res.user import PasswordError
@@ -49,7 +49,7 @@ class UserTestCase(TestCase):
             os.path.join(os.path.dirname(__file__), 'forbidden.txt'))
         self.addCleanup(config.set, 'password', 'forbidden', forbidden)
 
-        reset_from = config.get('email', 'from', fallback='')
+        reset_from = config.get('email', 'from', default='')
         config.set('email', 'from', FROM)
         self.addCleanup(lambda: config.set('email', 'from', reset_from))
 
diff --git a/trytond/trytond/transaction.py b/trytond/trytond/transaction.py
index 30d509e861..bf73401ec0 100644
--- a/trytond/trytond/transaction.py
+++ b/trytond/trytond/transaction.py
@@ -12,17 +12,13 @@ from weakref import WeakValueDictionary
 
 from sql import Flavor
 
-from trytond.config import config
+import trytond.config as config
 from trytond.tools.immutabledict import ImmutableDict
 
 __all__ = ['Transaction',
     'check_access', 'without_check_access',
     'active_records', 'inactive_records']
 
-_retry = config.getint('database', 'retry')
-_cache_transaction = config.getint('cache', 'transaction')
-_cache_model = config.getint('cache', 'model')
-_cache_record = config.getint('cache', 'record')
 logger = logging.getLogger(__name__)
 
 
@@ -54,7 +50,8 @@ class _TransactionLockRecordsError(TransactionError):
 
 
 def record_cache_size(transaction):
-    return transaction.context.get('_record_cache_size', _cache_record)
+    return transaction.context.get(
+        '_record_cache_size', config.getint('cache', 'record'))
 
 
 def check_access(func=None, *, _access=True):
@@ -138,7 +135,8 @@ class Transaction(object):
             instance.timestamp = None
             instance.started_at = None
             instance.cache = WeakValueDictionary()
-            instance._cache_deque = deque(maxlen=_cache_transaction)
+            instance._cache_deque = deque(
+                maxlen=config.getint('cache', 'transaction'))
             instance._atexit = []
             transactions.append(instance)
         else:
@@ -162,9 +160,10 @@ class Transaction(object):
         keys = tuple(((key, self.context[key])
                 for key in sorted(self.cache_keys)
                 if key in self.context))
+        cache_model = config.getint('cache', 'model')
         cache = self.cache.setdefault(
             (self.user, keys), LRUDict(
-                _cache_model,
+                cache_model,
                 lambda name: LRUDict(
                     record_cache_size(self),
                     Pool().get(name)._record),
@@ -210,9 +209,10 @@ class Transaction(object):
             self.connection = database.get_connection(readonly=readonly,
                 autocommit=autocommit, statement_timeout=timeout)
             count = 0
+            retry = config.getint('database', 'retry')
             while True:
                 if count:
-                    time.sleep(0.02 * (_retry - count))
+                    time.sleep(0.02 * (retry - count))
                 try:
                     lock_tables = extras.get('_lock_tables', [])
                     for table in lock_tables:
@@ -224,7 +224,7 @@ class Transaction(object):
                         locked_records[table].update(ids)
                     self._locked_records = locked_records
                 except backend.DatabaseOperationalError:
-                    if count < _retry:
+                    if count < retry:
                         self.connection.rollback()
                         count += 1
                         logger.debug("Retry: %i", count)
diff --git a/trytond/trytond/url.py b/trytond/trytond/url.py
index f05ef397cd..b4e86ac1b0 100644
--- a/trytond/trytond/url.py
+++ b/trytond/trytond/url.py
@@ -5,7 +5,7 @@ import encodings.idna
 import socket
 import urllib.parse
 
-from trytond.config import config
+import trytond.config as config
 from trytond.transaction import Transaction
 
 __all__ = ['URLMixin', 'is_secure', 'host', 'http_host']
diff --git a/trytond/trytond/worker.py b/trytond/trytond/worker.py
index 57322fed86..942a759fab 100644
--- a/trytond/trytond/worker.py
+++ b/trytond/trytond/worker.py
@@ -12,8 +12,7 @@ from multiprocessing import cpu_count
 
 from sql import Flavor
 
-from trytond import backend
-from trytond.config import config
+from trytond import backend, config
 from trytond.exceptions import UserError, UserWarning
 from trytond.pool import Pool
 from trytond.status import processing
diff --git a/trytond/trytond/wsgi.py b/trytond/trytond/wsgi.py
index 57ef856320..237bf70175 100644
--- a/trytond/trytond/wsgi.py
+++ b/trytond/trytond/wsgi.py
@@ -27,8 +27,7 @@ try:
 except ImportError:
     from werkzeug.wsgi import SharedDataMiddleware
 
-from trytond import backend, security
-from trytond.config import config
+from trytond import backend, config, security
 from trytond.protocols.jsonrpc import JSONProtocol
 from trytond.protocols.wrappers import (
     HTTPStatus, Request, Response, abort, exceptions)