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I ran into two huge tips that helped me a lot as I was averaging 15- yes 15 fps on a core i5 with A 670 GTX card. first one is make sure the game is running under the correct operating system. my rig is running win 7 64 bit but when I checks the compatibility by right clicking on the desktop icon I found the game was for whatever reason running under winxp a 32 bit system.
2.) force the game into running under directx9...for whatever reason the optimization code in the game for 10 and 11 are basically not done well
so say we all