I've searched around and there seems to be an issue with the kernel_task process quite frequently jumping up to 70%+ CPU utilization and after that only 1 core works. I don't think it is strictly a heat issue as my cpu stays under 60 deg C during this issue. It goes away if I sleep/awake or restart the MBA. For me it happens when I connect and access/xfer something with my NAS.. so intensive network connections in general I think. Anyone else? This is really annoying. When kernel_task uses that much CPU the mouse skips and its hard to do anything. http://discussions.apple.com/thread.jspa?threadID=1394682&tstart=0 btw, I'm a new member here. Long time lurker and even longer mac user.