OMG, I love it when people post that they spike around 180 fps at one moment, then squeak about studders in the next. (usually around 12 fps)
Turn On Your VSync.
It's not just AHII using it.
I would recommend that people use some type of half assd research, before posting crap.
Coogan
Hoping this isn't directed at me, as i do indeed have a 120hz monitor (sorry, left that out) and i DO have vsync enabled, not to mention that at 120 FPS if i had vsync off I would see screen tearing, not microsutter. I guess I should also state that I have an i7 2600k and a gtx 580 in my computer and do not have a problem running 120 fps steady on my computer with my current in game settings. Even when the microstutter occurrs, the FPS do not drop.
Semp, thank you for the info, I shall try that next time I'm at my home PC. It makes sense that its probably more related to the TrackIR than it is AH.
And Chalenge, "affinity" is just that, setting a program to run on either one or multiple specific cores. I tried doing this with AH, but it never crossed my mind to set the trackIR's affinity. I'll give that a shot as well.