[issue38895] performance degradation creating a mock object (by factor 7-8)

[Marcel Zięba]

Marcel Zięba <marseel at gmail.com> added the comment:

This is the first commit I've observed slow down:

77b3b7701a34ecf6316469e05b79bb91de2addfa

Especially this part looks suspicious
https://github.com/python/cpython/commit/77b3b7701a34ecf6316469e05b79bb91de2addfa#diff-ff75b1b83c21770847ade91fa5bb2525R366

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<https://bugs.python.org/issue38895>
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