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I just installed 12.04 and want to try make it work by changing whats slow but 1st i need to find what slows it down but how? I want see results and be able to compare between versions.

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In the terminal type top and it'll show you a list of processes that uses most of the resources (ctrl+alt+T = terminal)

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I would start with running system monitor (type 'monitor' in unity) to check which processes are top consumers and what is the load.

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