Anyone else get this? I go from like 50-60 FPS (horrible for my machine) down to like 20-30FPS when I zoom in... even with the pistol it like drops to 30ish FPS...

P4 2.6C HT (800FSB) | Corsair XMS PC3500C2PT 512Mb | Albatron GeForce FX5900PV 128Mb (5950Ultra Bios Flash)