One thing that i've seen a couple of times now with these types of demos is that the animation is pretty smooth, but the music / sound is stuttering and noisy. Anyone has that as well? I'm using Chrome on a pretty beefy (16GB) MacBook Pro.
Audio very badly stutters here under Firefox on a reasonable spec Win 8.1 PC - 3.6GHz i3-4160 dual core, GTX 970, 16GB RAM. Not an award winning spec system, but for single threaded maximised games (most) it's more than decent. ;)