Now, I don't want to try to sound like i'm selling something because this program is free, but I've been using game booster for 2 weeks(ish) now and it's probably my favorite thing I've downloaded.
http://www.iobit.com/gamebooster.html
all it is, is a simple program that lets you pick and choose processes to shut off or keep on to allow more of your computers memory to focus on your game. There's even a "game box" mode that allows you to launch your game from game booster and it will throw extra amounts of your computers memory to the game.
The things it shuts off by default are stuff that you honestly don't need turned on all the time like windows updater.
and here's a video
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