Ivan Levkivskyi <levkivs...@gmail.com> added the comment:

> Isn't 800 lines of C code too high price for speeding up ABCs creation?

800 lines of C code is not something hard to notice, so I suppose the answer is 
obvious for all people involved in the work on PR :-)

> ...this can save just several milliseconds at start-up.

The correct way to measure this is relative, not absolute. There are just few 
ABCs used by modules loaded at Python start-up, and it already allowed to save 
10% of start-up time. My expectation is that the number will be similar for a 
typical Python app. Moreover, `isinstance` and `issubclass` (functions called 
often with ABCs) will be 1.5x faster.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31333>
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