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Tue Jun 10 22:29:07 CEST 2014 · https://mail.python.org/pipermail/python-dev/2014-June/135015.html

2014-06-10 18:30 GMT+02:00 Steve Dower <Steve.Dower at microsoft.com>:
> I ran a quick test with profile-guided optimization (PGO, pronounced "pogo"), which has supposedly been improved since VC9, and saw a very unscientific 20% speed improvement on pybench.py and 10% size reduction in python35.dll. I'm not sure what we used to get from VC9, but it certainly seems worth enabling provided it doesn't break anything. (Interestingly, PGO decided that only 1% of functions needed to be compiled for speed. Not sure if I can find out which ones those are but if anyone's interested I can give it a shot?)

If we upgrade the compiler on Windows, some optimizer options can
maybe be enabled again. Previous Visual Studio (2010?) bugs:

* http://bugs.python.org/issue15993

* http://bugs.python.org/issue8847#msg166935

Victor

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[Python-Dev] Python 3.5 on VC14