I’m measuring the performance of an animation.
enter image description here

When i use the following code to measure FPS, it’s inconsistent with Chrome Frame rendering stats.

var lastTime = performance.now();
var frame = 0;
var lastFameTime = performance.now();

var loop = function(time) {
    var now =  performance.now();
    var fs = (now - lastFameTime);
    lastFameTime = now;
    var fps = Math.round(1000/fs);
    frame++;
    if (now > 1000 + lastTime) {
        var fps = Math.round( ( frame * 1000 ) / ( now - lastTime ) );
        frame = 0;    
        lastTime = now;    
    };           
    window.requestAnimFrame(loop);   
}

How can I get the same stats as Chrome Frame rendering stats?

I expect to get a method for measuring animation performance.