From 78c16165858ae38dd586f5ceb2e4d78d4846fa3e Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Thu, 17 Oct 2024 15:28:12 -1000
Subject: [PATCH] Improve performance of `URL.with_scheme` (#1322)

---
 CHANGES/1322.misc.rst | 1 +
 yarl/_url.py          | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)
 create mode 100644 CHANGES/1322.misc.rst

diff --git a/CHANGES/1322.misc.rst b/CHANGES/1322.misc.rst
new file mode 100644
index 000000000..23b7d6263
--- /dev/null
+++ b/CHANGES/1322.misc.rst
@@ -0,0 +1 @@
+Improved performance of the :py:meth:`~yarl.URL.with_scheme` method -- by :user:`bdraco`.
diff --git a/yarl/_url.py b/yarl/_url.py
index 630be469b..f978d0616 100644
--- a/yarl/_url.py
+++ b/yarl/_url.py
@@ -1172,13 +1172,15 @@ def with_scheme(self, scheme: str) -> "URL":
         if not isinstance(scheme, str):
             raise TypeError("Invalid scheme type")
         lower_scheme = scheme.lower()
-        if not self._val.netloc and lower_scheme in SCHEME_REQUIRES_HOST:
+        _, netloc, path, query, fragment = self._val
+        if not netloc and lower_scheme in SCHEME_REQUIRES_HOST:
             msg = (
                 "scheme replacement is not allowed for "
                 f"relative URLs for the {lower_scheme} scheme"
             )
             raise ValueError(msg)
-        return self._from_val(self._val._replace(scheme=lower_scheme))
+        val = tuple.__new__(SplitResult, (lower_scheme, netloc, path, query, fragment))
+        return self._from_val(val)
 
     def with_user(self, user: Union[str, None]) -> "URL":
         """Return a new URL with user replaced.