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So clearng my cache every once in a while won't speed anything up? Will it ruin my browser if I do clear it? Will it slow it down if I clear it? I'm just trying to understand this all. Sorry for all the questions.

I was wondering if I should clear my browser's cache and if so how often? Also how often should I clear my history. There is also an option in the browsers settings that says accept cookie data that is checked, should I leave it checked or should I un-check it? Sorry for all the questions. Also...