This optimizes your system while a game runs by turning off unnecessary services and I'm not sure what else, but I just tried the 3.5 beta version and it seems to do what it claims to do quite well and
revert all of its changes as soon as no games are running. I saw marked improvement in FPS rates and general performance on the five or six games I tried. Unfortunately, TS2 showed the least improvement of the games I tried. I am convinced I just have too much CC in at the moment, particularly texture intensive stuff. Although this machine has 8GB of RAM, TS2 can only use a fraction of that, and I suspect it is bloated with textures. I will have to adopt a strategy of default replacement of some of the more pathetic Eaxis offerings with CC that I prefer.
Up to now, Game Booster
has been freeware, but after the 30th the company will start charging for it. Even if you don't think you want/need it, I would recommend downloading it while it's free. It really does seem to work wonders.