diff --git a/modules/account/move.py b/modules/account/move.py
index 4f0cd8c17f..d7f0d5bda1 100644
--- a/modules/account/move.py
+++ b/modules/account/move.py
@@ -152,11 +152,12 @@ class Move(ModelSQL, ModelView):
     def default_company():
         return Transaction().context.get('company')
 
-    @staticmethod
-    def default_period():
+    @classmethod
+    def default_period(cls):
         Period = Pool().get('account.period')
-        return Period.find(Transaction().context.get('company'),
-            exception=False)
+        company = cls.default_company()
+        period = Period.find(company, exception=False)
+        return period.id if period else None
 
     @staticmethod
     def default_state():
@@ -385,10 +386,10 @@ class Move(ModelSQL, ModelView):
                         move=self.rec_name))
             with Transaction().set_context(company=self.company.id):
                 date = Date.today()
-            period_id = Period.find(self.company.id, date=date)
+            period = Period.find(self.company, date=date)
             default.update({
                     'date': date,
-                    'period': period_id,
+                    'period': period.id,
                     })
         if reversal:
             default['lines.debit'] = lambda data: data['credit']
@@ -1561,7 +1562,7 @@ class Line(MoveLineMixin, ModelSQL, ModelView):
         if not date:
             with Transaction().set_context(company=company.id):
                 date = Date.today()
-        period_id = Period.find(reconcile_account.company.id, date=date)
+        period = Period.find(reconcile_account.company, date=date)
         account = None
         journal = None
         if writeoff:
@@ -1574,7 +1575,7 @@ class Line(MoveLineMixin, ModelSQL, ModelView):
         move = Move()
         move.company = company
         move.journal = journal
-        move.period = period_id
+        move.period = period
         move.date = date
         move.description = description
 
@@ -1665,11 +1666,13 @@ class OpenJournalAsk(ModelView):
             ('state', '!=', 'close'),
             ])
 
-    @staticmethod
-    def default_period():
-        Period = Pool().get('account.period')
-        return Period.find(Transaction().context.get('company'),
-                exception=False)
+    @classmethod
+    def default_period(cls):
+        pool = Pool()
+        Period = pool.get('account.period')
+        company = Transaction().context.get('company')
+        period = Period.find(company, exception=False)
+        return period.id if period else None
 
 
 class OpenJournal(Wizard):
@@ -2359,7 +2362,7 @@ class GroupLines(Wizard):
         if not date:
             with Transaction().set_context(company=company.id):
                 date = Date.today()
-        period = Period.find(company.id, date=date)
+        period = Period.find(company, date=date)
 
         move = Move()
         move.company = company
@@ -2621,7 +2624,7 @@ class RescheduleLines(Wizard):
         if not date:
             with Transaction().set_context(company=company.id):
                 date = Date.today()
-        period = Period.find(company.id, date=date)
+        period = Period.find(company, date=date)
 
         move = Move()
         move.company = company
@@ -2818,7 +2821,7 @@ class DelegateLines(Wizard):
         if not date:
             with Transaction().set_context(company=company.id):
                 date = Date.today()
-        period = Period.find(company.id, date=date)
+        period = Period.find(company, date=date)
 
         move = Move()
         move.company = company
diff --git a/modules/account/move_template.py b/modules/account/move_template.py
index d481d8cc48..979369d6f7 100644
--- a/modules/account/move_template.py
+++ b/modules/account/move_template.py
@@ -405,12 +405,13 @@ class CreateMoveTemplate(ModelView):
                 Eval('context', {}).get('company', 0)),
             ])
 
-    @staticmethod
-    def default_period():
+    @classmethod
+    def default_period(cls):
         pool = Pool()
         Period = pool.get('account.period')
         company = Transaction().context.get('company')
-        return Period.find(company, exception=False)
+        period = Period.find(company, exception=False)
+        return period.id if period else None
 
 
 class CreateMoveKeywords(ModelView):
diff --git a/modules/account/period.py b/modules/account/period.py
index 3dd3618b00..73b227c8a6 100644
--- a/modules/account/period.py
+++ b/modules/account/period.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.cache import Cache
 from trytond.const import OPERATORS
 from trytond.i18n import gettext
 from trytond.model import Index, ModelSQL, ModelView, Workflow, fields
@@ -50,6 +51,7 @@ class Period(Workflow, ModelSQL, ModelView):
     company = fields.Function(fields.Many2One('company.company', 'Company',),
         'on_change_with_company', searcher='search_company')
     icon = fields.Function(fields.Char("Icon"), 'get_icon')
+    _find_cache = Cache(__name__ + '.find', context=False)
 
     @classmethod
     def __setup__(cls):
@@ -180,39 +182,46 @@ class Period(Workflow, ModelSQL, ModelView):
                         second=periods[0].rec_name))
 
     @classmethod
-    def find(cls, company_id, date=None, exception=True, test_state=True):
+    def find(cls, company, date=None, exception=True, test_state=True):
         '''
-        Return the period for the company_id
-            at the date or the current date.
-        If exception is set the function will raise an exception
-            if no period is found.
-        If test_state is true, it will search on non-closed periods
+        Return the period for the company at the date or the current date.
+        If exception is set it raises an exception if no period is found.
+        If test_state is true, it searches on non-closed periods
         '''
         pool = Pool()
         Date = pool.get('ir.date')
         Lang = pool.get('ir.lang')
 
+        company_id = int(company) if company is not None else None
         if not date:
             with Transaction().set_context(company=company_id):
                 date = Date.today()
-        clause = [
-            ('start_date', '<=', date),
-            ('end_date', '>=', date),
-            ('fiscalyear.company', '=', company_id),
-            ('type', '=', 'standard'),
-            ]
-        if test_state:
-            clause.append(('state', '=', 'open'))
-        periods = cls.search(clause, order=[('start_date', 'DESC')], limit=1)
-        if not periods:
-            if exception:
-                lang = Lang.get()
-                raise PeriodNotFoundError(
-                    gettext('account.msg_no_period_date',
-                        date=lang.strftime(date)))
+        key = (company_id, date, test_state)
+        period = cls._find_cache.get(key, -1)
+        if period is not None and period < 0:
+            clause = [
+                ('start_date', '<=', date),
+                ('end_date', '>=', date),
+                ('fiscalyear.company', '=', company_id),
+                ('type', '=', 'standard'),
+                ]
+            if test_state:
+                clause.append(('state', '=', 'open'))
+            periods = cls.search(
+                clause, order=[('start_date', 'DESC')], limit=1)
+            if periods:
+                period, = periods
             else:
-                return None
-        return periods[0].id
+                period = None
+            cls._find_cache.set(key, int(period) if period else None)
+        elif period is not None:
+            period = cls(period)
+        if not period and exception:
+            lang = Lang.get()
+            raise PeriodNotFoundError(
+                gettext('account.msg_no_period_date',
+                    date=lang.strftime(date)))
+        return period
 
     @classmethod
     def _check(cls, periods):
@@ -267,7 +276,9 @@ class Period(Workflow, ModelSQL, ModelView):
                 if not vals.get('post_move_sequence'):
                     vals['post_move_sequence'] = (
                         fiscalyear.post_move_sequence.id)
-        return super(Period, cls).create(vlist)
+        periods = super(Period, cls).create(vlist)
+        cls._find_cache.clear()
+        return periods
 
     @classmethod
     def write(cls, *args):
@@ -307,11 +318,13 @@ class Period(Workflow, ModelSQL, ModelView):
                                     period=period.rec_name))
             args.extend((periods, values))
         super(Period, cls).write(*args)
+        cls._find_cache.clear()
 
     @classmethod
     def delete(cls, periods):
         cls._check(periods)
         super(Period, cls).delete(periods)
+        cls._find_cache.clear()
 
     @classmethod
     @ModelView.button
diff --git a/modules/account/tax.py b/modules/account/tax.py
index 29b6898995..1ba5840caf 100644
--- a/modules/account/tax.py
+++ b/modules/account/tax.py
@@ -557,8 +557,9 @@ class TaxCodeContext(ModelView):
     def default_period(cls):
         pool = Pool()
         Period = pool.get('account.period')
-        return Period.find(
+        period = Period.find(
             cls.default_company(), exception=False, test_state=False)
+        return period.id if period else None
 
     @fields.depends(
         'method', 'company',
diff --git a/modules/account_asset/asset.py b/modules/account_asset/asset.py
index 9d3853a69b..d5b27f790e 100644
--- a/modules/account_asset/asset.py
+++ b/modules/account_asset/asset.py
@@ -534,7 +534,7 @@ class Asset(Workflow, ModelSQL, ModelView):
         Move = pool.get('account.move')
         MoveLine = pool.get('account.move.line')
 
-        period_id = Period.find(self.company.id, line.date)
+        period = Period.find(self.company, line.date)
         with Transaction().set_context(date=line.date):
             expense_line = MoveLine(
                 credit=0,
@@ -550,7 +550,7 @@ class Asset(Workflow, ModelSQL, ModelView):
         return Move(
             company=self.company,
             origin=line,
-            period=period_id,
+            period=period,
             journal=self.account_journal,
             date=line.date,
             lines=[expense_line, depreciation_line],
@@ -596,7 +596,7 @@ class Asset(Workflow, ModelSQL, ModelView):
         if date is None:
             with Transaction().set_context(company=self.company.id):
                 date = Date.today()
-        period_id = Period.find(self.company.id, date)
+        period = Period.find(self.company, date)
         if self.supplier_invoice_line:
             account_asset = self.supplier_invoice_line.account.current()
         else:
@@ -626,7 +626,7 @@ class Asset(Workflow, ModelSQL, ModelView):
         return Move(
             company=self.company,
             origin=self,
-            period=period_id,
+            period=period,
             journal=self.account_journal,
             date=date,
             lines=lines,
@@ -886,12 +886,12 @@ class UpdateAsset(Wizard):
         pool = Pool()
         Period = pool.get('account.period')
         Move = pool.get('account.move')
-        period_id = Period.find(asset.company.id, self.show_move.date)
+        period = Period.find(asset.company, self.show_move.date)
         return Move(
             company=asset.company,
             origin=asset,
             journal=asset.account_journal.id,
-            period=period_id,
+            period=period,
             date=self.show_move.date,
             )
 
diff --git a/modules/account_dunning_fee/dunning.py b/modules/account_dunning_fee/dunning.py
index 11e7ca6035..48261f9712 100644
--- a/modules/account_dunning_fee/dunning.py
+++ b/modules/account_dunning_fee/dunning.py
@@ -140,7 +140,7 @@ class FeeDunningLevel(ModelSQL, ModelView):
         move.company = self.dunning.company
         move.journal = self.level.fee.journal
         move.date = today
-        move.period = Period.find(move.company.id, date=today)
+        move.period = Period.find(move.company, date=today)
         move.origin = self
         move.description = self.level.fee.name
 
diff --git a/modules/account_invoice/invoice.py b/modules/account_invoice/invoice.py
index d6d4ddc711..0a8b7a12ab 100644
--- a/modules/account_invoice/invoice.py
+++ b/modules/account_invoice/invoice.py
@@ -1093,11 +1093,11 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
                 remainder_total_currency
 
         accounting_date = self.accounting_date or self.invoice_date or today
-        period_id = Period.find(self.company.id, date=accounting_date)
+        period = Period.find(self.company, date=accounting_date)
 
         move = Move()
         move.journal = self.journal
-        move.period = period_id
+        move.period = period
         move.date = accounting_date
         move.origin = self
         move.company = self.company
@@ -1174,11 +1174,10 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
             pattern = pattern.copy()
 
         accounting_date = self.accounting_date or self.invoice_date
-        period_id = Period.find(
-            self.company.id, date=accounting_date,
+        period = Period.find(
+            self.company, date=accounting_date,
             test_state=self.type != 'in')
 
-        period = Period(period_id)
         fiscalyear = period.fiscalyear
         pattern.setdefault('company', self.company.id)
         pattern.setdefault('fiscalyear', fiscalyear.id)
@@ -1443,10 +1442,10 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
             if line.account.party_required:
                 line.party = party
 
-        period_id = Period.find(self.company.id, date=date)
+        period = Period.find(self.company, date=date)
 
         move = Move(
-            journal=payment_method.journal, period=period_id, date=date,
+            journal=payment_method.journal, period=period, date=date,
             origin=self, description=description,
             company=self.company, lines=lines)
         move.save()
diff --git a/modules/account_invoice_defer/account.py b/modules/account_invoice_defer/account.py
index 08c70a6420..7d46446cbc 100644
--- a/modules/account_invoice_defer/account.py
+++ b/modules/account_invoice_defer/account.py
@@ -214,7 +214,7 @@ class InvoiceDeferred(Workflow, ModelSQL, ModelView):
         Period = pool.get('account.period')
         # Ensure it starts at an opened period
         for deferral in deferrals:
-            Period.find(deferral.company.id, deferral.start_date)
+            Period.find(deferral.company, deferral.start_date)
         # Set state before create moves and defer amount to pass assert
         cls.write(deferrals, {'state': 'running'})
         cls.create_moves(deferrals)
diff --git a/modules/account_payment_clearing/payment.py b/modules/account_payment_clearing/payment.py
index 06f0e6f3e1..601e1eb048 100644
--- a/modules/account_payment_clearing/payment.py
+++ b/modules/account_payment_clearing/payment.py
@@ -246,7 +246,7 @@ class Payment(metaclass=PoolMeta):
         if date is None:
             with Transaction().set_context(company=self.company.id):
                 date = Date.today()
-        period = Period.find(self.company.id, date=date)
+        period = Period.find(self.company, date=date)
 
         local_currency = self.journal.currency == self.company.currency
         if not local_currency:
diff --git a/modules/account_statement/statement.py b/modules/account_statement/statement.py
index 11a64b5444..ab0f69689b 100644
--- a/modules/account_statement/statement.py
+++ b/modules/account_statement/statement.py
@@ -576,9 +576,9 @@ class Statement(Workflow, ModelSQL, ModelView):
         Move = pool.get('account.move')
         Period = pool.get('account.period')
 
-        period_id = Period.find(self.company.id, date=key['date'])
+        period = Period.find(self.company, date=key['date'])
         return Move(
-            period=period_id,
+            period=period,
             journal=self.journal.journal,
             date=key['date'],
             origin=self,
diff --git a/modules/account_stock_anglo_saxon/invoice.py b/modules/account_stock_anglo_saxon/invoice.py
index 630a5e257b..ee6e2d23cf 100644
--- a/modules/account_stock_anglo_saxon/invoice.py
+++ b/modules/account_stock_anglo_saxon/invoice.py
@@ -70,8 +70,7 @@ class InvoiceLine(metaclass=PoolMeta):
 
         accounting_date = (self.invoice.accounting_date
             or self.invoice.invoice_date)
-        period_id = Period.find(self.invoice.company.id, date=accounting_date)
-        period = Period(period_id)
+        period = Period.find(self.invoice.company, date=accounting_date)
         if period.fiscalyear.account_stock_method != 'anglo_saxon':
             return result
 
diff --git a/modules/account_stock_continental/product.py b/modules/account_stock_continental/product.py
index 7bd126eea2..ccb29711e6 100644
--- a/modules/account_stock_continental/product.py
+++ b/modules/account_stock_continental/product.py
@@ -211,7 +211,7 @@ class Product(metaclass=PoolMeta):
         company = Company(context['company'])
         with Transaction().set_context(company=company.id):
             stock_date_end = Date.today()
-        period = Period(Period.find(company.id, date=stock_date_end))
+        period = Period.find(company, date=stock_date_end)
         if period.fiscalyear.account_stock_method:
             moves = []
             with Transaction().set_context(locations=[l.id for l in locations],
diff --git a/modules/account_stock_continental/stock.py b/modules/account_stock_continental/stock.py
index bf53f50590..6d62e7edce 100644
--- a/modules/account_stock_continental/stock.py
+++ b/modules/account_stock_continental/stock.py
@@ -105,20 +105,19 @@ class Move(metaclass=PoolMeta):
         with Transaction().set_context(company=self.company.id):
             today = Date.today()
         for date in [self.effective_date, today]:
-            period_id = Period.find(
-                self.company.id, date=date, exception=False, test_state=False)
-            if not period_id and date < today:
+            period = Period.find(
+                self.company, date=date, exception=False, test_state=False)
+            if not period and date < today:
                 return
-            elif period_id:
+            elif period:
                 break
         else:
             return
-        period = Period(period_id)
         if not period.fiscalyear.account_stock_method:
             return
         if period.state != 'open':
             date = today
-            period = Period(Period.find(self.company.id, date=date))
+            period = Period.find(self.company, date=date)
 
         type_ = self._get_account_stock_move_type()
         if not type_:
@@ -153,7 +152,7 @@ class Move(metaclass=PoolMeta):
             'stock_journal', company=self.company.id)
         return AccountMove(
             journal=journal,
-            period=period_id,
+            period=period,
             date=date,
             origin=self,
             lines=account_move_lines,
diff --git a/modules/account_tax_cash/account.py b/modules/account_tax_cash/account.py
index 2ee6be0d35..fb9d6d6c9f 100644
--- a/modules/account_tax_cash/account.py
+++ b/modules/account_tax_cash/account.py
@@ -306,7 +306,7 @@ class Invoice(metaclass=PoolMeta):
                     date = Transaction().context.get(
                         'payment_date', Date.today())
                 periods[invoice.company] = Period.find(
-                    invoice.company.id, date=date)
+                    invoice.company, date=date)
             period = periods[invoice.company]
             ratio = invoice.cash_paid_ratio
             for line in invoice.move.lines:
@@ -331,8 +331,7 @@ class InvoiceTax(metaclass=PoolMeta):
                 accounting_date = (
                     self.invoice.accounting_date or self.invoice.invoice_date)
                 period = Period.find(
-                    self.invoice.company.id, date=accounting_date)
-                period = Period(period)
+                    self.invoice.company, date=accounting_date)
             return period.is_on_cash_basis(self.tax)
 
 
diff --git a/modules/commission_waiting/commission.py b/modules/commission_waiting/commission.py
index d62b1bdf7c..56220e4251 100644
--- a/modules/commission_waiting/commission.py
+++ b/modules/commission_waiting/commission.py
@@ -70,7 +70,7 @@ class Commission(metaclass=PoolMeta):
         if date is None:
             with Transaction().set_context(company=self.agent.company.id):
                 date = Date.today()
-        period = Period.find(self.agent.company.id, date=date)
+        period = Period.find(self.agent.company, date=date)
 
         move = Move(journal=self.get_journal(), origin=self,
             date=date, period=period, company=self.agent.company)
diff --git a/modules/sale_point/sale.py b/modules/sale_point/sale.py
index 3fa8a0a7db..306902e66e 100644
--- a/modules/sale_point/sale.py
+++ b/modules/sale_point/sale.py
@@ -358,7 +358,7 @@ class POSSale(Workflow, ModelSQL, ModelView, TaxableMixin):
         Move = pool.get('account.move')
         Period = pool.get('account.period')
 
-        period_id = Period.find(self.company.id, date=self.date)
+        period = Period.find(self.company, date=self.date)
         lines = []
         for line in self.lines:
             move_lines = line.get_account_move_lines()
@@ -376,7 +376,7 @@ class POSSale(Workflow, ModelSQL, ModelView, TaxableMixin):
 
         move = Move()
         move.journal = self.point.journal
-        move.period = period_id
+        move.period = period
         move.date = self.date
         move.origin = self
         move.company = self.company
@@ -1299,7 +1299,7 @@ class POSCashTransfer(Workflow, ModelSQL, ModelView):
         Move = pool.get('account.move')
         Period = pool.get('account.period')
 
-        period_id = Period.find(self.company.id, date=self.date)
+        period = Period.find(self.company, date=self.date)
         line = Line()
         if self.amount >= 0:
             line.debit, line.credit = self.amount, Decimal(0)
@@ -1312,7 +1312,7 @@ class POSCashTransfer(Workflow, ModelSQL, ModelView):
 
         move = Move()
         move.journal = self.type.journal
-        move.period = period_id
+        move.period = period
         move.date = self.date
         move.origin = self
         move.company = self.company