Here's a guide I used a while back, and since then there has been a massive improvement in my FPS, and overall computer speed.
Also if you don't care about looks, on tweak number 2 hit adjust for best performance. Hope this helped you, and if it did please leave a comment
Well for starters gamebooster uses memory up while claiming to improve fps...
If you follow the guide performance will be much better than with gamebooster and this is not just for a game,
its for the whole computer