All bodies disappear when they die so I don't think it's that, and I have an i7 3.2ghz, 6gb ram, Radeon5850 (dated but still handles most things fine) and I'm running windows 7 x64
I've never had issues with games and turning down the graphics sorts any fps issue, but I am trying to change everything and it's making literally no difference, I can turn all the settings off or have them high and it still gets the same FPS