Actually I have a similar problem........
Not so much as "warping", but a frame drop (stuttering?). I usually get around 50-60 frames cruising, down to maybe 35 if many cons, fires, smoke, clouds etc.
I can do all ACMs without any problem, however the instant I start firing, my frame rate drops to 15-20, went down to 10 during testing if I fired for more than 2-3 seconds continuously. Can't figure it out.
One other thing, when I was in a mossie, I got the same problem if I fired the 30cals, but could fire 20mms all day without any frame drop. Led me to think its got something to do with the muzzle flahes or smoke emmissions. Tried disabling weapon effects, vehicle effects, terrain effects, moved sliders to max perfromance and min range......the works.....same problem. What gives?
Ideas anyone?