I must ask everybody on this thread cause it may be related. I noticed since the new beta patch that the lag we experience with the joystick has extended to Track-IR inputs. I'm not sure it's from the new patch or whatever it might be due to, but it is really inconvenient. for the record I also activated the FXAA in game, but how could it have impact on head movements?
before anybody ask I've got a cool framerate, the game is fluid, I don't have any real value but no FPS hit or some disgraceful stuff in this fiel.

so...any feedback on this or am I definitely partying too much and this slimmy head movements come from my imagination?

make sure you aren't in precision mode in trackir.

nop! I'm quite used to track IR, but I can assure I'm not in precision mode. what I'm talking about is a slight delay between my head movements and their reproduction in the game, and also what can be seen as a smoothing effect of the movements. BUT I didn't change anything in my profile and in other games using track IR my head movements are quicker and sharper. so...