diff --git a/pyproject.toml b/pyproject.toml
index b38a40da33fb..6174f6138447 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ select = [
     "B", # flake8-bugbear
     "FA", # flake8-future-annotations
     "I", # isort
+    "PERF", # Perflint
     "PGH", # pygrep-hooks
     "RUF", # Ruff-specific and unused-noqa
     "UP", # pyupgrade
@@ -87,11 +88,15 @@ ignore = [
     ###
     # Rules we don't want or don't agree with
     ###
-    # Slower and more verbose https://github.com/astral-sh/ruff/issues/7871
-    "UP038", # Use `X | Y` in `isinstance` call instead of `(X, Y)`
     # Used for direct, non-subclass type comparison, for example: `type(val) is str`
     # see https://github.com/astral-sh/ruff/issues/6465
     "E721", # Do not compare types, use `isinstance()`
+    # Can easily produce false-positives. Worth checking but don't block CI.
+    # Anyway Python 3.11 introduced "zero cost" exception handling for the non-error path.
+    # Our tests & scripts run on modern Python versions.
+    "PERF203", # try-except within a loop incurs performance overhead
+    # Slower and more verbose https://github.com/astral-sh/ruff/issues/7871
+    "UP038", # Use `X | Y` in `isinstance` call instead of `(X, Y)`
     ###
     # False-positives, but already checked by type-checkers
     ###
diff --git a/scripts/create_baseline_stubs.py b/scripts/create_baseline_stubs.py
index 69f5d2b307e3..c0b986d52eea 100755
--- a/scripts/create_baseline_stubs.py
+++ b/scripts/create_baseline_stubs.py
@@ -90,14 +90,10 @@ async def get_upstream_repo_url(project: str) -> str | None:
 
         # Order the project URLs so that we put the ones
         # that are most likely to point to the source code first
-        urls_to_check: list[str] = []
         url_names_probably_pointing_to_source = ("Source", "Repository", "Homepage")
-        for url_name in url_names_probably_pointing_to_source:
-            if url := project_urls.get(url_name):
-                urls_to_check.append(url)
-        urls_to_check.extend(
+        urls_to_check = [url for url_name in url_names_probably_pointing_to_source if (url := project_urls.get(url_name))] + [
             url for url_name, url in project_urls.items() if url_name not in url_names_probably_pointing_to_source
-        )
+        ]
 
         for url in urls_to_check:
             # Remove `www.`; replace `http://` with `https://`