Then you have other issues. Make sure you dont have lots of other processess eating your cpu time. dont blame the game till you find out the truth.
I run a 4400 + single core at 2.1 ghz, 4 gig ram, nvidea gtx 8800 and hit 20 fps
All I can assume is you got a krap video card or cpu binding from too many processes. Its not the game...