If you have access to root, and are running heavy loads on your mysql (e.g. running a forum), then I recommend that you download mytop and run it on your server. mytop is like Linux "top" command, but it shows you the current mysql queries, time they are taking to run, etc.
I discoverd quite a few dreaded "table scans" using this tool. My server is running x5 faster as a result of some simple fixes (i.e. adding proper index).
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