var start = Date.now();
setTimeout(function() {
	var t0 = performance.now(), t1;
  for ( var i = 0; i < 500; ++i ) {
   console.log('lolwut?');
  }
  t1 = performance.now();
  console.log(t1 - t0);
}, 0);
var end = Date.now();
console.log(end - start); // 0ms