Antoine Pitrou <pit...@free.fr> added the comment:

> While I like faster startup time, I don't know 4% speed up is worth enough 
> for this complexity.

There's no magic bullet that I know of to reduce startup time by a large 
amount.  So we're left with optimizing progressively.  For comparison, 
https://github.com/python/cpython/pull/3279 had an even smaller effect on 
startup time.

This change has the nice property that it's a genuine speed-up on a generic 
operation, and it reduces the cost of adding slots as well as the cost of 
having long inheritance chains.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32346>
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