How to solve slow processor speed

How do you troubleshoot extremely slow processing speed on an Intel based iMac? I have already emptied cache memory, force quit or closed all programs and rebooted. This did not solve the problem.

Open Activity Monitor (Applications - Utilities - Activity Monitor) and see if there are any processes that are using unususal amounts of %CPU. If they are quit that process.
BTW please fill out your profile so we know what iMac you have and what version of OS X you are running.

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