Merge pull request matplotlib#24847 from QuLogic/affine-perf

Avoid extra copy initializing empty Affine2D

Author: rcomer

lib/matplotlib/transforms.py

@@ -1890,7 +1890,7 @@ def __init__(self, matrix=None, **kwargs):
         super().__init__(**kwargs)
         if matrix is None:
             # A bit faster than np.identity(3).
-            matrix = IdentityTransform._mtx.copy()
+            matrix = IdentityTransform._mtx
         self._mtx = matrix.copy()
         self._invalid = 0