diff --git a/odoo/addons/base/models/ir_http.py b/odoo/addons/base/models/ir_http.py
index 1dbb94cca5b..3eba7932a44 100644
--- a/odoo/addons/base/models/ir_http.py
+++ b/odoo/addons/base/models/ir_http.py
@@ -79,6 +79,42 @@ class SignedIntConverter(NumberConverter):
     num_convert = int
 
 
+class LazyCompiledBuilder:
+    def __init__(self, rule, _compile_builder, append_unknown):
+        self.rule = rule
+        self._callable = None
+        self._compile_builder = _compile_builder
+        self._append_unknown = append_unknown
+
+    def __get__(self, *args):
+        # Rule.compile will actually call
+        #
+        #   self._build = self._compile_builder(False).__get__(self, None)
+        #   self._build_unknown = self._compile_builder(True).__get__(self, None)
+        #
+        # meaning the _build and _build unkown will contain _compile_builder().__get__(self, None).
+        # This is why this override of __get__ is needed.
+        return self
+
+    def __call__(self, *args, **kwargs):
+        if self._callable is None:
+            self._callable = self._compile_builder(self._append_unknown).__get__(self.rule, None)
+            del self.rule
+            del self._compile_builder
+            del self._append_unknown
+        return self._callable(*args, **kwargs)
+
+
+class FasterRule(werkzeug.routing.Rule):
+    """
+    _compile_builder is a major part of the routing map generation and rules
+    are actually not build so often.
+    This classe makes calls to _compile_builder lazy
+    """
+    def _compile_builder(self, append_unknown=True):
+        return LazyCompiledBuilder(self, super()._compile_builder, append_unknown)
+
+
 class IrHttp(models.AbstractModel):
     _name = 'ir.http'
     _description = "HTTP Routing"
@@ -206,7 +242,7 @@ class IrHttp(models.AbstractModel):
                 routing = submap(endpoint.routing, ROUTING_KEYS)
                 if routing['methods'] is not None and 'OPTIONS' not in routing['methods']:
                     routing['methods'] = routing['methods'] + ['OPTIONS']
-                rule = werkzeug.routing.Rule(url, endpoint=endpoint, **routing)
+                rule = FasterRule(url, endpoint=endpoint, **routing)
                 rule.merge_slashes = False
                 routing_map.add(rule)
             cls._routing_map[key] = routing_map