Strangely enough, I get the following results running on perl 5.40, MacBook Air M1 2020, MacOS 14.6.1:

Air:~/private/perl$ tim
v5.40.0
0.0340678691864014 my outside
0.0305979251861572 my inside
Air:~/private/perl$ tim
v5.40.0
0.028965950012207 my outside
0.0283629894256592 my inside
Air:~/private/perl$ tim
v5.40.0
0.0341758728027344 my outside
0.0308210849761963 my inside
Air:~/private/perl$ tim
v5.40.0
0.0342879295349121 my outside
0.0307750701904297 my inside
Air:~/private/perl$ tim
v5.40.0
0.0342922210693359 my outside
0.0308101177215576 my inside
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Running the same code on my 2012 Intel MacBookPro, OSX 10.15.7, perl 5.40, gives the expected results (outside is faster).