What have you done to my game?

[warbirds]

I had it working great, no stutters, smooth play, great graphics. But now after this so called beta patch it runs like xxxx. Sutters, stops and looks bad.

I did have everything maxed but now I have everything meduim or low with no grass just to smooth it out a bit, and it still halts and stutters.

I was afraid of this happening, just to placate the texture whinners you guys changed something that robs me of performance.

System:
I7 to 3.35
GTX 580
and the usual other tweaks and fine tuning.