well i suppose the title tells it all, my friend and I and allot of other people i play with have this problem, its really annoying as we cant perform well due to this... for us Frames drop really badly (6-12 fps) when there is dust killed up, smoke, smoke from he rounds or bullets or anything like that in front of us... also when something in the game explodes or there is very loud sound or anything like that for my friend the game just freezes for a few seconds or the frames go down to 1 - 3 fps.