Some people have asked me about something I mentioned regarding CSS3 animations and efficient transforms.
I'm seeing a lot of people translating their CSS animations directly from jQuery and not taking any performance into consideration.
Fortunately I found a tweet from @johnallsopp that very simply highlights why you should be careful how you craft you animations:
"wow. Animate change to left via CSS, ~500 paint/reflow events. Animate translateX - 16!"
Some useful articles about reflow/repaint: