Every once in a while I'm the stupid one at work. Was wondering why my Google Chart tooltips flickered on hover. Found some bug and a workaround on SO but it kept happening. Then I noticed the container div kept refreshing and I couldn't explain why. Until I commented all my code and by systematically enabling it line by line I noticed my dumb ass used setInterval instead of setTimeout. Well yes if you keep redrawing the chart it is going to flicker! *facepalm*