Most 2008 and Early 2009 iMac's only came from the factory with 2GB of RAM, and you may need more RAM to help with multi tasking in Mountain Lion than you needed in 10.6. To find out for sure, open your Activity Monitor and check your RAM (System Memory) usage as per > Using Activity Monitor to read System Memory
You should also check to see how full your Hard Drive is, because as the Hard Drive becomes full the slower the computer will run.
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