Due to the ever increasing power of graphics and the expenses of hardware. There is a free program that works real well for gaming. Game booster by IObit shuts down all background files/programs running to increase gaming preformance. I myself have used this program for about a year now and I've noticed the changes in my games such as Crysis 1 and 2, Cod4, CoD bo, MW2,, I suggest this amazing program to all gamers and also provides protection of your computer a little bit and also can clean and repair your hardware.
https://download.cnet.com/Game-Booster/3000-18512_4-10913645.html