After downloading and installing Mountain Lion my iMac 27" is nearly non-functioning.  SLOW beyond endurance on my part!  This same thing happened after downloading Lion last year.  An Apple advisor had me reload it.  Still terrible!  Help?

Has anyone had this problem?  Any solution(s) welcome!

Thanks for the info.  I'll have to check this later this evening, since I'm in my office presently.
However, I do think it is (was) indexing.

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