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JS performance timer
var perfnow = (function() {
return (
(performance && performance.now) ? function() { return performance.now(); }
: (performance && performance.webkitNow) ? function() { return performance.webkitNow(); }
: (performance && performance.mozNow) ? function() { return performance.mozNow(); }
: (performance && performance.oNow) ? function() { return performance.oNow(); }
: (Date.now) ? function() { return Date.now(); }
: function() { return +new Date(); }
)
}());