diff --git a/modules/openapi-generator/src/main/resources/python/configuration.mustache b/modules/openapi-generator/src/main/resources/python/configuration.mustache
index a5c74424d80..c3799c0c5e0 100644
--- a/modules/openapi-generator/src/main/resources/python/configuration.mustache
+++ b/modules/openapi-generator/src/main/resources/python/configuration.mustache
@@ -4,6 +4,9 @@
 
 import copy
 import logging
+{{^asyncio}}
+import multiprocessing
+{{/asyncio}}
 import sys
 import urllib3
 
@@ -239,6 +242,15 @@ conf = {{{packageName}}}.Configuration(
            Default values is 100, None means no-limit.
         """
         {{/asyncio}}
+        {{^asyncio}}
+        self.connection_pool_maxsize = multiprocessing.cpu_count() * 5
+        """urllib3 connection pool's maximum number of connections saved
+           per pool. urllib3 uses 1 connection as default value, but this is
+           not the best value when you are making a lot of possibly parallel
+           requests to the same host, which is often the case here.
+           cpu_count * 5 is used as default value to increase performance.
+        """
+        {{/asyncio}}
 
         self.proxy = None
         """Proxy URL
diff --git a/modules/openapi-generator/src/main/resources/python/rest.mustache b/modules/openapi-generator/src/main/resources/python/rest.mustache
index 1fc57bd83e9..f0998845859 100644
--- a/modules/openapi-generator/src/main/resources/python/rest.mustache
+++ b/modules/openapi-generator/src/main/resources/python/rest.mustache
@@ -77,6 +77,9 @@ class RESTClientObject:
         if configuration.socket_options is not None:
             addition_pool_args['socket_options'] = configuration.socket_options
 
+        if configuration.connection_pool_maxsize is not None:
+            addition_pool_args['maxsize'] = configuration.connection_pool_maxsize
+
         # https pool manager
         if configuration.proxy:
             if is_socks_proxy_url(configuration.proxy):
diff --git a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/configuration.py b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/configuration.py
index b7218cb4ff2..7c6f3e11f99 100644
--- a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/configuration.py
+++ b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/configuration.py
@@ -15,6 +15,7 @@
 
 import copy
 import logging
+import multiprocessing
 import sys
 import urllib3
 
@@ -164,6 +165,13 @@ conf = openapi_client.Configuration(
            Set this to the SNI value expected by the server.
         """
 
+        self.connection_pool_maxsize = multiprocessing.cpu_count() * 5
+        """urllib3 connection pool's maximum number of connections saved
+           per pool. urllib3 uses 1 connection as default value, but this is
+           not the best value when you are making a lot of possibly parallel
+           requests to the same host, which is often the case here.
+           cpu_count * 5 is used as default value to increase performance.
+        """
 
         self.proxy = None
         """Proxy URL
diff --git a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/rest.py b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/rest.py
index 86762867f67..5d0ca946c1f 100644
--- a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/rest.py
+++ b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent-true/openapi_client/rest.py
@@ -88,6 +88,9 @@ class RESTClientObject:
         if configuration.socket_options is not None:
             addition_pool_args['socket_options'] = configuration.socket_options
 
+        if configuration.connection_pool_maxsize is not None:
+            addition_pool_args['maxsize'] = configuration.connection_pool_maxsize
+
         # https pool manager
         if configuration.proxy:
             if is_socks_proxy_url(configuration.proxy):
diff --git a/samples/client/echo_api/python/openapi_client/configuration.py b/samples/client/echo_api/python/openapi_client/configuration.py
index b7218cb4ff2..7c6f3e11f99 100644
--- a/samples/client/echo_api/python/openapi_client/configuration.py
+++ b/samples/client/echo_api/python/openapi_client/configuration.py
@@ -15,6 +15,7 @@
 
 import copy
 import logging
+import multiprocessing
 import sys
 import urllib3
 
@@ -164,6 +165,13 @@ conf = openapi_client.Configuration(
            Set this to the SNI value expected by the server.
         """
 
+        self.connection_pool_maxsize = multiprocessing.cpu_count() * 5
+        """urllib3 connection pool's maximum number of connections saved
+           per pool. urllib3 uses 1 connection as default value, but this is
+           not the best value when you are making a lot of possibly parallel
+           requests to the same host, which is often the case here.
+           cpu_count * 5 is used as default value to increase performance.
+        """
 
         self.proxy = None
         """Proxy URL
diff --git a/samples/client/echo_api/python/openapi_client/rest.py b/samples/client/echo_api/python/openapi_client/rest.py
index 86762867f67..5d0ca946c1f 100644
--- a/samples/client/echo_api/python/openapi_client/rest.py
+++ b/samples/client/echo_api/python/openapi_client/rest.py
@@ -88,6 +88,9 @@ class RESTClientObject:
         if configuration.socket_options is not None:
             addition_pool_args['socket_options'] = configuration.socket_options
 
+        if configuration.connection_pool_maxsize is not None:
+            addition_pool_args['maxsize'] = configuration.connection_pool_maxsize
+
         # https pool manager
         if configuration.proxy:
             if is_socks_proxy_url(configuration.proxy):
diff --git a/samples/openapi3/client/petstore/python/petstore_api/configuration.py b/samples/openapi3/client/petstore/python/petstore_api/configuration.py
index 0d1672dcb41..8bca6dc7ab0 100755
--- a/samples/openapi3/client/petstore/python/petstore_api/configuration.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/configuration.py
@@ -14,6 +14,7 @@
 
 import copy
 import logging
+import multiprocessing
 import sys
 import urllib3
 
@@ -229,6 +230,13 @@ conf = petstore_api.Configuration(
            Set this to the SNI value expected by the server.
         """
 
+        self.connection_pool_maxsize = multiprocessing.cpu_count() * 5
+        """urllib3 connection pool's maximum number of connections saved
+           per pool. urllib3 uses 1 connection as default value, but this is
+           not the best value when you are making a lot of possibly parallel
+           requests to the same host, which is often the case here.
+           cpu_count * 5 is used as default value to increase performance.
+        """
 
         self.proxy = None
         """Proxy URL
diff --git a/samples/openapi3/client/petstore/python/petstore_api/rest.py b/samples/openapi3/client/petstore/python/petstore_api/rest.py
index a7ba897c3ed..ff75022d695 100755
--- a/samples/openapi3/client/petstore/python/petstore_api/rest.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/rest.py
@@ -87,6 +87,9 @@ class RESTClientObject:
         if configuration.socket_options is not None:
             addition_pool_args['socket_options'] = configuration.socket_options
 
+        if configuration.connection_pool_maxsize is not None:
+            addition_pool_args['maxsize'] = configuration.connection_pool_maxsize
+
         # https pool manager
         if configuration.proxy:
             if is_socks_proxy_url(configuration.proxy):