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OK, reformatting will frequently resolve the problem, as it "goes away of its own accord" but problems that go away of their own frequently come back of their own. And the process teaches you nothing about the workings of your system
I completely agree with "nihil" I have went through many formats and reformats. Sometimes I get so angry with a shitty PC and I just am like screw it and want to reformat. But as nihil pointed out, you don't learn anything about your system. For instance right now you have no idea what is causing the lagg....it could very well be a quick fix in the registry or a quick ram upgrade and you went through the long process of a reformat.