SOO I use crossfire 7950 set up so I was extremely perplexed when I was getting 9-12 fps when ♥♥♥♥ hit the fan, well that had to do with physics, so I found out through my own research that if you go into the:
Which is located in wherever your game is installed through steam
and you open that with notepad and change these values to 0
@p.hardware = 0 @p.fluids = 0 @p.cloth = 0
Your game should run at a crisp fps, I only noticed the fps drop when Icsicles fell, which had to do with physics, so far ive noticed no change in the quality of my game, have fun everyone!