Slow JS execution with chrome dev tools open
Did you know turning on Chrome developer tools slows down JS execution significantly? I didn't, until I was trying to debug a slow C3.JS chart for an hour, then realised it was only slow when I was debugging....
Here's the same action (check/uncheck x2) with and without the dev tools open (then one with network logging off, just to check). It's 3 times slower with the dev tools open.