Drive by split() limit to improve performance

Author: uranusjr

src/pip/_internal/commands/debug.py

@@ -136,7 +136,7 @@ def show_tags(options: Values) -> None:
 def ca_bundle_info(config: Configuration) -> str:
     # Ruff misidentifies config as a dict.
     # Configuration does not have support the mapping interface.
-    levels = {key.split(".")[0] for key, _ in config.items()}  # noqa: PERF102
+    levels = {key.split(".", 1)[0] for key, _ in config.items()}  # noqa: PERF102
     if not levels:
         return "Not specified"