Has anyone noticed odd CPU behavior looking at this site with Chrome? Several times today I've had a thread use about 100% of my CPU; closing the TeX.SX tab solved the problem. But I haven't found a way to reliably reproduce the problem. (I'm on a Mac).
Update: go to this post. Center the scrollable code in the first response on your screen. Scroll down to the bottom, and continue scrolling (so that your mouse goes out of the frame into the rest of the post). At least for me, that pegs my CPU.