I've been able to resolve this issue in the past by using rotation: 0.01, using x or y rather than left or top as well as force3d, etc. Can't figure out why this animation seems to jump forward every so often. I'm using this animation setup to allow export to MP4 and even stepping one frame at a time to capture the canvas shows the jerkiness even more. It's not consistent so obviously has to do with browser performance. I just can't figure out what to do to resolve it.
Any ideas? Anyone?