Cacheman is a PC optimization tool that can fix slow downs, lag, and stuttering not only in desktop applications, but also in computer games including Battlefield 3/4, Call of Duty, Dishonored, and Crysis 3. It will give more CPU power and make more memory (RAM) available to the game.
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I wouldn't say it's not free. Some of the features are just disabled in the version you don't pay for. It doesn't shut down completely like some programs do.