The Game laggs very hard!!

[Kingcox01 2]

Hi, as the title says i have a problem with this game it laggs very hard and i turned it on very high but my computer is actually extremly good i also can play Battlefield 3 on Ultra for example. Here are my PC settings:

AMD Radeon HD 7850 Club Edition

AMD Bulldozer Six Core 3,20 Ghz

8GB Kingston DDr 3 Ram

Windows 7 Home Premium

500Gb Harddrive

I hope for a fast answer because this really annoys me O.o