You can get a port of ptmalloc2 to win32/win64 at http://
www.nedprod.com/programs/Win32/ptmalloc2/. 
ptmalloc2 is very considerably faster than the MSVC 
CRT allocator in small object allocations such as those 
python would frequently make. If one were to replace 
python's allocator with ptmalloc2, one should expect to 
see a sizeable speed increase.

As to my knowledge python extension modules don't 
pass malloced blocks between themselves and the core 
interpreter, there shouldn't be a problem with calling the 
wrong allocator with the wrong block. However if there 
were problems, ptmalloc2 allocated blocks are very 
easily recognisable from MSVC allocated ones and so 
the core interpreter could easily free any kind of allocated 
block. The reverse, unfortunately, is not the case unless 
one forced all python extension modules to use a python 
provided allocator.

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I'm rejecting the idea. There is no proof that there would
indeed be a speed improvement, and I very much doubt such a
claim. Python uses obmalloc for most objects, so malloc
performance is mostly irrelevant.