"I use chrome to check my tests, I find chrome to be the fastest browser and more reliable in sound issues currently. Yes, the webgl is enabled (not disabled in the chrome://flags)"
Maybe it's being reported incorrectly? Do webgl only effects display? My experience is that C2 is always smooth with webgl, even at low frame rates its consistent, but non webgl is always very jerky, and have tested this on 5 machines/devices. , win7, android, linux, linux in a vm, win8, using a variety of methods (manually disabling gpu, using different browser, etc) to cripple or enable the webgl.
This is literally all I have to go on.
It looks like either DT is inconsistent or there is some sort of pixel rounding issue in certain contexts. at least to my eyes. (I keep harping on pixel rounding problems because if things are being rounded wrong or being forced to render at solid positions, you could get a discrepency of as much as 2 pixels per tick, and that would have a net effect of looking a lot like the jerkiness we're seeing).
Again though, I've only seen it happen in non webgl mode.
And to note, I do not believe it's C2's doing. I'm pretty convinced this is a technical limitation to canvas.