Drastically decreased F.E.A.R. performance

[Hail The Brain Slug]

I got a 7900GT about a week ago, and it works great. I was getting 58 FPS avg in F.E.A.R. at 1280X960 4X/16X. I tried out some TweaksRus drivers, 84.56V2, and still got the same 58 FPS average, but I decided to leave the tweaksrus drivers installed. Today, I booted up looking forward to some F.E.A.R. action to be greeted by some 34FPS average on the same settings as before, same drivers, etc. 3DMark05 runs fine and other games like Quake 4 and Call of Duty 2 also run fine.

I uninstalled the 84.56v2 drivers and installed the latest WHQL 84.21 drivers, but that didn't change a thing. What could be wrong with my F.E.A.R.?

 

[quattro1]

Do you by chance have Soft Shadows on with AA? Those dont work together...

 

[TanisHalfElven]

could be fragmenting (i am just throwing in the dark here)