This is kind of driving me crazy. One of the processes in iStat Pro often shows up as taking up the most CPU resources, but doesn't have a text label next to it. It is the first (and fifth) process shown in the attached screen grab. What is it?
I get that too, usually when a widget is refreshing. If it reduces after a few seconds then it's nothing to worry about - but if it's a constant thing, you might want to look into which one is causing it.
Ahhh, thanks for the replies. Makes much sense. I thought that that icon might have something to do with dashboard or the OS, but for some reason I just couldn't put two and two together. Anyway, mystery solved. Thanks a bunch.