Return quickly if series

pandas/core/frame.py

@@ -1971,6 +1971,10 @@ def to_dict(self, orient: str = "dict", into=dict):
  elif orient.startswith("i"):
  orient = "index"
 
+ if orient == "series":
+ # GH46470 Return quickly if orient series to avoid creating dtype objects
+ return into_c((k, v) for k, v in self.items())
+
  object_dtype_indices = [
  i
  for i, col_dtype in enumerate(self.dtypes.values)
@@ -2021,9 +2025,6 @@ def to_dict(self, orient: str = "dict", into=dict):
  )
  )
 
- elif orient == "series":
- return into_c((k, v) for k, v in self.items())
-
  elif orient == "records":
  columns = self.columns.tolist()
  if are_all_object_dtype_cols: