diff --git a/addons/point_of_sale/models/pos_order.py b/addons/point_of_sale/models/pos_order.py
index ba771928d96..e58476a4584 100644
--- a/addons/point_of_sale/models/pos_order.py
+++ b/addons/point_of_sale/models/pos_order.py
@@ -3,7 +3,7 @@
 import logging
 from datetime import datetime
 from markupsafe import Markup
-from functools import partial
+from functools import partial, lru_cache
 from itertools import groupby
 from collections import defaultdict
 
@@ -418,8 +418,18 @@ class PosOrder(models.Model):
 
     @api.depends('date_order', 'company_id', 'currency_id', 'company_id.currency_id')
     def _compute_currency_rate(self):
+        @lru_cache
+        def get_rate(from_currency, to_currency, company, date):
+            return self.env['res.currency']._get_conversion_rate(
+                from_currency=from_currency,
+                to_currency=to_currency,
+                company=company,
+                date=date,
+            )
         for order in self:
-            order.currency_rate = self.env['res.currency']._get_conversion_rate(order.company_id.currency_id, order.currency_id, order.company_id, order.date_order)
+            # date_order is a datetime, but the rates are looked up on a date basis,
+            # therefor converting the date_order to a date helps with sharing entries in the lru_cache
+            order.currency_rate = get_rate(order.company_id.currency_id, order.currency_id, order.company_id, order.date_order.date())
 
     @api.depends('lines.is_total_cost_computed')
     def _compute_is_total_cost_computed(self):
diff --git a/addons/pos_sale/models/pos_order.py b/addons/pos_sale/models/pos_order.py
index 534ccc869a3..a8b02052461 100644
--- a/addons/pos_sale/models/pos_order.py
+++ b/addons/pos_sale/models/pos_order.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
+from functools import lru_cache
 
 from odoo import api, fields, models, _
 from odoo.tools import float_compare, float_is_zero
@@ -24,9 +25,19 @@ class PosOrder(models.Model):
 
     @api.depends('date_order', 'company_id')
     def _compute_currency_rate(self):
+        @lru_cache
+        def get_rate(from_currency, to_currency, company, date):
+            return self.env['res.currency']._get_conversion_rate(
+                from_currency=from_currency,
+                to_currency=to_currency,
+                company=company,
+                date=date,
+            )
         for order in self:
             date_order = order.date_order or fields.Datetime.now()
-            order.currency_rate = self.env['res.currency']._get_conversion_rate(order.company_id.currency_id, order.currency_id, order.company_id, date_order)
+            # date_order is a datetime, but the rates are looked up on a date basis,
+            # therefor converting the date_order to a date helps with sharing entries in the lru_cache
+            order.currency_rate = get_rate(order.company_id.currency_id, order.currency_id, order.company_id, date_order.date())
 
     def _prepare_invoice_vals(self):
         invoice_vals = super(PosOrder, self)._prepare_invoice_vals()