Speeding up HTML5 rendering of animations using your GPU is one of the many features you can enable at about:flags in Google Chrome.
This will speed up many of the flash-like animations that use the HTML5 2D Canvas.
With the HTML5 2D Canvas activated it makes it so that canvas-based games and animations run faster and feel smoother. You can go to
chrome://gpu to see which features are being accelerated. This is a sometimes a tricky area to optimize, because the wide variety of hardware and operating system configurations found in the wild. THere have been a series of small improvements to the way this acceleration works in the latest release.