I don't think my system is too out dated, quad core, 6 gigs of ram, 64 bit with an Nvidia 9800 GT+ video card but I find that after playing for a few minutes my mouse pointer starts to slow down and the game becomes somewhat unplayable. I can ALT/TAB out and run a memory manager utility and then jump back in and all is well... for a short time

Does everyone have a stronger machine than mine, or am I doing something wrong in the setup department?