PERF: avoid calling DataFrame.dtypes in loop (#59573)

Author: messense

pandas/core/generic.py

@@ -600,9 +600,10 @@ def _get_cleaned_column_resolvers(self) -> dict[Hashable, Series]:
         if isinstance(self, ABCSeries):
             return {clean_column_name(self.name): self}
 
+        dtypes = self.dtypes
         return {
             clean_column_name(k): Series(
-                v, copy=False, index=self.index, name=k, dtype=self.dtypes[k]
+                v, copy=False, index=self.index, name=k, dtype=dtypes[k]
             ).__finalize__(self)
             for k, v in zip(self.columns, self._iter_column_arrays())
             if not isinstance(k, int)