JamesBoi28,
There is no such software that can make a computer perform better than it is capable of and how the computer is used and looked after by the user/s determines how efficient the computer will run, good housekeeping such as clearing temp files, uninstalling unused programs correctly and regular security scans as a couple of examples help to keep a computer running as it should.
For an informed explanation regarding system tweakers and registry cleaners take a look at miekiemoes' Blog here
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