From 03851d1353f66b4b40593a03c7d5f14b16122944 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Fri, 11 Oct 2024 09:19:24 -0500
Subject: [PATCH] Improve performance of default auth (#9466)

---
 CHANGES/9466.feature.rst |  1 +
 aiohttp/client.py        | 13 ++++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)
 create mode 120000 CHANGES/9466.feature.rst

diff --git a/CHANGES/9466.feature.rst b/CHANGES/9466.feature.rst
new file mode 120000
index 00000000000..a54874e90e0
--- /dev/null
+++ b/CHANGES/9466.feature.rst
@@ -0,0 +1 @@
+8966.feature.rst
\ No newline at end of file
diff --git a/aiohttp/client.py b/aiohttp/client.py
index 3546b7462c5..05476f6fccd 100644
--- a/aiohttp/client.py
+++ b/aiohttp/client.py
@@ -231,6 +231,7 @@ class ClientSession:
 
     __slots__ = (
         "_base_url",
+        "_base_url_origin",
         "_source_traceback",
         "_connector",
         "_loop",
@@ -295,10 +296,12 @@ def __init__(
         self._connector: Optional[BaseConnector] = None
         if base_url is None or isinstance(base_url, URL):
             self._base_url: Optional[URL] = base_url
+            self._base_url_origin = None if base_url is None else base_url.origin()
         else:
             self._base_url = URL(base_url)
+            self._base_url_origin = self._base_url.origin()
             assert (
-                self._base_url.origin() == self._base_url
+                self._base_url_origin == self._base_url
             ), "Only absolute URLs without path part are supported"
 
         loop = asyncio.get_running_loop()
@@ -566,8 +569,12 @@ async def _request(
                     if auth is None:
                         auth = auth_from_url
 
-                    if auth is None and (
-                        not self._base_url or self._base_url.origin() == url.origin()
+                    if (
+                        auth is None
+                        and self._default_auth
+                        and (
+                            not self._base_url or self._base_url_origin == url.origin()
+                        )
                     ):
                         auth = self._default_auth
                     # It would be confusing if we support explicit