I don't know about when the rest of you actually experiencing this problem, but for all the people who don't have/understand the problem, I get this problem ANY time I look around. It doesn't matter whether I'm holding ALT and free looking from a vehicle, when running, when aiming "from the hip", when aiming through the sights, when standing still and free looking. It simply doesn't matter - it's always present. :eek:
Also in case the devs are interested, the input lag gets worse when I alt-tab out of the game, then return to it. I also notice that there will be almost no input lag, but upon changing the video memory setting it is very noticeable. It doesn't matter what I change it to, from the point of changing it on, it is always there. (Until I restart the game.)