Stefan Behnel <stefan...@behnel.de> added the comment:

It turns out that "update_slot()" is always called, even when we are not 
updating a slot name (which is always a special dunder-name). The linear search 
for names in "update_slots()" is a huge waste of time here, and 
short-circuiting out of it when the name does not start with "_" cuts the 
overall update time by 50%. I pushed a PR.

Another improvement would be a sub-linear algorithm for searching the slot 
name, but that's a bigger change.

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nosy: +scoder

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36012>
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