on 2013-08-03

performance

jsPerf — JavaScript performance playground http://jsperf.com/

HTML5 test http://html5test.com/

JavaScript Benchmark http://www.webkit.org/perf/sunspider/sunspider.html

var perf = function (testName, fn) {
    var startTime = new Date().getTime();
    fn();
    var endTime = new Date().getTime();
    console.log(testName + ": " + (endTime - startTime) + "ms");
}

jQuery
console.time("timerName");
// javascript
console.timeEnd("timerName");