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iMac is polling something, running Safari.
This makes my iMac sluggish and gets hot.
Acrobat Reader, a plug in of Safari, must be wasting processor time by polling something, or doing an infinite loop, instead of suspending itself as a scheduler job, then waiting for interrupts.
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Why not disable it to see if that's what is actually happening?
How to Remove the Adobe Acrobat Reader Plugin from Safari in Mac OS X