Steve Dower <steve.do...@python.org> added the comment:

At a guess, it's probably the signal emulation (a.k.a. Ctrl+C support). We 
could save some time by checking the requested handle first without blocking, 
and only beginning the blocking call if it's not available.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41299>
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