Use traceback.extract_stack() instead of inspect.stack() to check upper stack method, they are at same functionality, but the traceback(5μs) is 50x faster than inspect.stack(2ms). This method affects many common operation, such as add() and from_timestamp(tz), 2ms delay typically cause performance issues. (#716)

Author: aploium

pendulum/datetime.py

@@ -3,6 +3,7 @@
 import calendar
 import datetime
 import sys
+import traceback
 
 from typing import TYPE_CHECKING
 from typing import Any
@@ -1218,9 +1219,7 @@ def __add__(self, other: datetime.timedelta) -> Self:
             # This is a workaround for Python 3.8+
             # since calling astimezone() will call this method
             # instead of the base datetime class one.
-            import inspect
-
-            caller = inspect.stack()[1][3]
+            caller = traceback.extract_stack(limit=2)[0].name
             if caller == "astimezone":
                 return super().__add__(other)