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romad Level 3 Level 3 (590 points)

I upped the RAM to 20 GB but that hasn't helped. When I check with Activity Monitor, the most CPU usage is by ActivityMonitord, followed by SystemUIServer. Once I restart, everything is fine for a few hours but then it slows down again. As an example, opening System Preferences takes just under 2 minutes during the slow down.

 

Any ideas?  I was wondering if it might be due to PPC code remnants; I've tried to delete all PPC applications but there may be pieces I've missed.

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