On my system, with an Nvidia GT 220 card, all RW3 settings at the hightest level (except for AA at 2), I am generally running at 14 FPS. From reading posts by others, that would be considered quite low, unacceptably low.
I have yet to see the FPS dip below 14 FPS even briefly, which makes me wonder if it is a true reading. Is it some kind of minimum set by RW3? Is that even possible, to set a minimum limit? I have seen the FPS go up to 17-20 range briefly.
As to 14 FPS being unacceptably low, I don't see any stuttering.