This game has a poor engine console and even on my system it only get 20 to 60 FPS @ 1680 X 1050 with Avg FPS around 30 to 35! with all that said it not the sort of game thats needs high FPS!
as i told you in the other thread, the engine is not the problem. the engine is fantastic and will be in many many games because of how fantastic it is.
teh problem with the game is the port from console ( a closed hardware system) to the PC (a very open hardware system).
That is the problem. Not the engine. But the port to PC that isn't optimized for many different PC hardware combinations (nor drivers etc)