Where does it actually run well? It doesn't peg a core on Safari, but scrolling still feels laggy and unpleasant. I initially assumed you'd implemented your own inertial scrolling, as with old Google mobile sites.
It runs well on all my PCs, which admittedly are all Windows. It's just an SVG+SMIL animation. My opinion is that in 2013, it should run entirely on the GPU. But I acknowledge that's not the case as much as I think it should be.
On my box, it uses ~2.1% CPU and ~16% GPU in Aurora.
On my box, it uses ~2.1% CPU and ~16% GPU in Aurora.