Motion tracking seems to be about 20x+ slower on Windows 8 (don’t have a different version to test). I tried using a Mac Mini using both OS X and Windows 8 x64 with boot camp.
I also tested on a regular Windows laptop and motion tracking in windows is very very slow on it as well. Under Ubuntu 12.10 Linux on the same laptop motion tracking is fine.
I tried both 32 bit and 64 bit 2.65a and the new 2.66. Motion tracking in windows for all of them is too slow to be useable. [Update] Tried the mingw experimental release and it seems to run at normal speed.
Any ideas on why motion tracking under windows is so much slower (to the point of being unusable) [both machines use Radeon cards if that matters] ?