!xSpeed 

Fantastic tool to speed up windows or speed down windows -256~+256 times, All software (such as games or movies) will change their speed after you adjust the speed rating in !xSpeed.
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Cacheman 

Cacheman is a utility designed to improve the performance of your computer by optimizing the disk cache, memory and a number of other settings. Cacheman is able to prevent frequent paging to the hard disk, resulting in improved performance.
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The Mop 

The Mop is easy-to-use disk cleaner able to search garbage files in all folders on all hard disk. The Mop shows the decrease of performance made by garbage files. Using this tool can speed up the computer and get more free space to keep useful files.
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