Dear Ashley,
I have older IE, but Chrome, Opera and Firefox is actual. Jerking is visible by pure eye - it happens almost every 5 - 10 seconds. Tested on multiple computers. It is far away from smooth. Because of this I stopped all development. Hope you will reproduce it, if not i can try to record it somehow.
Chrome report about hardware acceleration:
Graphics Feature Status
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Disabled
Rasterization: Software only, hardware acceleration unavailable
Threaded Rasterization: Enabled
Video Decode: Hardware accelerated
Video Encode: Hardware accelerated
WebGL: Hardware accelerated