My frames have also gone lower all the time, and I´m running a fast rig!
XP2100+ OCd to 2400Mhz (faster than XP3000+), 1 gig memory and 9800Pro 128mb.
1280x1024 and 2xAA , 2xAF, and frames go near the ground around 20FPS... when the trees disappear, all will go to max 60 frames (TFT here...)
Trees and ground strucktures make my computer to kneel...
Dunno why because IL2 runs flawlessly with full settings and 10x better graphics..
MB soundchip in use here, Nforce2´s own MCCP-T