requestAnimationFrame

[sru]

I heard that requestAnimationFrame is more optimized than setTimeout or setInterval. Should we use it?

Here is the cross-browser way:

window.requestAnimFrame = (function() {
    return window.requestAnimationFrame ||
             window.webkitRequestAnimationFrame ||
             window.mozRequestAnimationFrame ||
             window.oRequestAnimationFrame ||
             window.msRequestAnimationFrame ||
             function(/* function FrameRequestCallback */ callback, /* DOMElement Element */ element) {
                 window.setTimeout(callback, 1000/60);
             };
})()

And you can visit this site to control fps.