Kristján Valur Jónsson <krist...@ccpgames.com> added the comment:

The problem with QueryPerformanceCounter is that it drifts.  It has high 
resolution, but can drift far out of sync with GetTickCount64.
The best solutions on windows combine the two, but that's tricky to impolement.

QPC will wrap, but only after a long time.  its 64 bits, and with a frequency 
of 1GHz, that takes some 600 years.
Of course, with 10GHz we're down to 60 years, but by that time, we will have 
python 2.8

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<http://bugs.python.org/issue10278>
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