What CPU is in there? You are dropping 30FPS from what total?
Well we are buying a new CPU soon since something happened to our current one (its not completely busted obviously, but we know it'll give out sooner or later). But I noticed anywhere from 60 - 80 fps when I was just walkin through with no heavy combat going on (like being ambushed by 4+ agents and all those animations goin on)
EDIT: this is our current processor (that's the CPU right?) AMD Athlon 64 X2 Dual Core Processor 6000+ (2 CPUs), ~3.0GHz
that was read directly off the dxdiag program