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Originally posted by me
I have an old PowerMac that starts up faster than my iMac. And that's saying something. I'm positive that it was a ton faster when I first got it two years ago.
Originally posted by RANT
If it's super slow, check for viruses. I had one.
But your computer doesn't sound all that overpowered to begin with. I'd do what it wants. It probably knows best.
Try this... Go to Applications > Utilities and find Disk Utility. Open this and select Macintosh HD
and click on Repair Permissions. Restart after this and see if there is an improvement in performance.