Running Windows 7 home premium 64-bit on all machines at home. At work it's windows 7 professional or enterprise or whatever. Only difference really is amount of ram, home machines have only 4 and work has 8. Home machines even all have after market video and rate between 5.9 and 7.1 in the performance index. Other new games are fine.
So ya its weird lol. But at least that fixes it.
As for the low FPS, my machine is actually the slowest in the house, kids got the quad cores and mine is just an old dual core refurb. Good video card though. But i always get low FPS.
Its kind of decieving though, its actually playable at that speed and is not as choppy as one would think.
What do you mean by profiling? I'm curious we are not open source but for you guys I could provide a build for r&d if you like.