Cache splitting keys.

chahak13 · chahak13 · commit 9a0ad032f586 · 2023-10-23T21:20:23.000-04:00
diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
@@ -685,9 +685,10 @@ def __init__(self, *args, **kwargs):
             name: mapping.new_child()
             for name, mapping in self._namespace_maps.items()
         }
-        self._mapping = ChainMap(*self._namespace_maps.values())
 
-    def _split_key(self, key, sep="."):
+    @staticmethod
+    @functools.lru_cache
+    def _split_key(key, sep="."):
         keys = key.split(sep, maxsplit=1)
         return keys, len(keys)
 
