Really, if your computer is as nimble as it should be, the lag between Firefox and Chrome should be minute or indistinguishable. A disk defrag is good. You can also do some other stuff – I find that the things that slow the computer down the most are those kajillion little utilities that come with your computer, and turn on in the background when you start up. You really don’t need most of them, so the best solution is to just go to the Control Panel and uninstall them (only do this if you know which are really integral to the system).
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