slight decrease in the fog online and my frame rate dropped from 27-30 at 3k alt (agl) to 10. Don't know if it's related but lost my stick and rudder pedals shortly after the change.
AMD 1600xp (running at ~1.4GHz)
256MB Ram
K7SEM main board
GeForce MX440 (AGP8x) with 64MB ram onboard
Edit: running AH2 at
800x600x32
video sliders set to about 1/2 way between quality and performance.