I have a strange issue on my Mac Mini.
I run it without a monitor as it is primarily an iTunes server but mount it via Screen sharing to my iMac.
Just FYI I am also running iStat Menu's so can easily see CPU performance etc.
If no activity on the Mac Mini everything is fine and CPU utilisation is quite low, apart from some BOINC apps that are running.
However, if there has been, not currently but has been some screen activity on teh Mac Mini then CPU is running about 60% and this is almost totally Screen Sharing!
If I 'touch' the iStat CPU menu, this high CPU falls away back to normal levels.
Something really weird is happening and i do not know what it is.
The screensharing CPU issue is still there in Mac OS 10.8.2 :-(
(i have the problem on my mid-2011 mac-mini server)
top sorted by CPU shows clearly two "screensharing"/"Screensharing" processes eating each about 45% CPU
Retrieving data ...