Comment by program

I got nice quality on Chrome 21. Substitute the window.requestAnimationFrame directive with:

  window.requestAnimationFrame = (function() {
    return window.requestAnimationFrame || window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame || window.oRequestAnimationFrame ||
    window.msRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60); };
  })();

and it will work in Opera 12 too.