Well, count me in as one that lost frame rate. Used to run at 70-75 fps, but now it is down to 40-45!! Get more than 5-6 aircraft in the picture and it is so bad, I can't engage enemy without losing them to stuttering and warpiness.
Also, to those that say anything over 30 fps is a waste...it is not! You don't see it, that is true, but what that higher frame rate means is a larger margin for frame rate drop as the skies get crowded (the more objects in the scene, the lower your frame rate drops). So yes, the more fps, the better. If you start at 30 fps, as soon as you enter a furball, you are hitting teens or less in your fps....not good. with 75+ fps, it takes a lot of planes in the sky to crank it below 30.