The best performance jumps that can literally be felt are getting a multi core processor if you are still running a single core. The improvement was amazing to me. SSDs also change the experience quite a bit.
As far as optimization tools, most are scams and don't really do anything. It'd be better to get someone with knowledge of computers to help you clean out your operating system for you with you present so you know what's going on and can tell him what programs you need or don't need running in the background.
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