Editing Dynamic vs Static rAF frameTime

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
// requestAnimationFrame polyfill by Erik Möller
// fixes from Paul Irish and Tino Zijdel
(function() {
  var lastTime = 0;
  var vendors = ['ms', 'moz', 'webkit', 'o'];
  for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
    window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame'];
  }

if (!window.requestAnimationFrame) window.requestAnimationFrame = function(callback, element) {
    var currTime = new Date().getTime();
    var timeToCall = Math.max(0, 16 - (currTime - lastTime));
    var id = window.setTimeout(function() {
      callback(currTime + timeToCall);
    }, timeToCall);
    lastTime = currTime + timeToCall;
    return id;
  };

if (!window.cancelAnimationFrame) window.cancelAnimationFrame = function(id) {
    clearTimeout(id);
  };
}());

ourCanvas = document.getElementById("gameCanvas");
context = ourCanvas.getContext('2d');
var img = new Image()
img.src = 'https://www.google.com/intl/ar_ALL/images/logos/images_logo_lg.gif';

Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ)

Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

var filterStrength = 50;
var frameTime = 30,
    lastLoop = new Date,
    thisLoop;

function gameLoop() {

  var thisFrameTime = (thisLoop = new Date) - lastLoop;
  frameTime += (thisFrameTime - frameTime) / filterStrength;
  lastLoop = thisLoop;

  setTimeout(function() {
    //code for any thing
    context.drawImage(img, 0, 0, 100, 100);
    requestAnimationFrame(gameLoop);

  }, 1000 / frameTime);
}

Test 2

Title

Async (check if this is an asynchronous test)

Code

var frameTime = 30;

function gameLoop() {
  setTimeout(function() {
    //code for any thing
    context.drawImage(img, 0, 0, 100, 100);

    requestAnimationFrame(gameLoop);

  }, 1000 / frameTime);
}