3 year old iMac 24 running OS10.7.4.  After it has been on for a day or so, it stops going to sleep and becomes very slow.  This only happens when Safari is running. Quitting Safari solves the problem.  Has anyone else have the same problem?

3 year old iMac 24 running OS 10.7.4.  After it has been on for a day or so, it stops going to sleep and becomes very slow.  This only happens when Safari is running. Quitting Safari solves the problem.  Has anyone else have the same problem?  Does not happen on MacBookpro only on iMac.

Hello Albert, see how many of these you can answer...
See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...
http://support.apple.com/kb/PH7029
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
In the Memory tab, are there a lot of Pageouts?

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