When you combine requestanimationframe with hardware acceleration (translate3d), animations get all jumpy. Some other observations: - When you trigger a paint every frame (somewhere on the page) things get smooth again - When you use 2d transforms it's a little better - Something like requestanimationframe(function() {setTimeout(draw, 0)}) seems to work the best for now Example: http://jsfiddle.net/ux3rqce0/5/ I'm using the latest Yosemite GM Safari Version 8.0 (10600.1.25) and I think iOS8 has the same problem although it's harder to observe on retina. On 10.9, everything seems to be OK.
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