diff --git a/sprite.js b/sprite.js
index c78484a..57dbdde 100644
--- a/sprite.js
+++ b/sprite.js
@@ -21,6 +21,87 @@
 		return result;
 	};
 
+	// 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
+
+	// MIT license
+	(function() {
+		var lastTime = 0,
+			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(),
+					timeToCall = Math.max(0, 16 - (currTime - lastTime)),
+					id = window.setTimeout(function() { callback(currTime + timeToCall); }, timeToCall);
+				lastTime = currTime + timeToCall;
+				return id;
+			};
+		}
+
+		if (!window.cancelAnimationFrame) {
+			window.cancelAnimationFrame = function(id) {
+				clearTimeout(id);
+			};
+		}
+	}());
+
+	/*
+	 * https://gist.github.com/joelambert/1002116
+	 * Drop in replace functions for setTimeout() & setInterval() that 
+	 * make use of requestAnimationFrame() for performance where available
+	 * http://www.joelambert.co.uk
+	 *
+	 * Copyright 2011, Joe Lambert.
+	 * Free to use under the MIT license.
+	 * http://www.opensource.org/licenses/mit-license.php
+	 */
+	window.requestInterval = function(fn, delay) {
+		if( !window.requestAnimationFrame       && 
+			!window.webkitRequestAnimationFrame && 
+			!(window.mozRequestAnimationFrame && window.mozCancelRequestAnimationFrame) && // Firefox 5 ships without cancel support
+			!window.oRequestAnimationFrame      && 
+			!window.msRequestAnimationFrame)
+				return window.setInterval(fn, delay);
+				
+		var start = new Date().getTime(),
+			handle = {};
+			
+		function loop() {
+			handle.value = requestAnimationFrame(loop);
+			var current = new Date().getTime(),
+				delta = current - start;
+				
+			if(delta >= delay) {
+				fn.call();
+				start = new Date().getTime();
+			}
+		}
+		
+		handle.value = requestAnimationFrame(loop);
+		return handle;
+	};
+	 
+	/**
+	 * Behaves the same as clearInterval except uses cancelRequestAnimationFrame() where possible for better performance
+	 * @param {int|object} fn The callback function
+	 */
+	window.clearRequestInterval = function(handle) {
+		window.cancelAnimationFrame ? window.cancelAnimationFrame(handle.value) :
+		window.webkitCancelAnimationFrame ? window.webkitCancelAnimationFrame(handle.value) :
+		window.webkitCancelRequestAnimationFrame ? window.webkitCancelRequestAnimationFrame(handle.value) : /* Support for legacy API */
+		window.mozCancelRequestAnimationFrame ? window.mozCancelRequestAnimationFrame(handle.value) :
+		window.oCancelRequestAnimationFrame	? window.oCancelRequestAnimationFrame(handle.value) :
+		window.msCancelRequestAnimationFrame ? window.msCancelRequestAnimationFrame(handle.value) :
+		clearInterval(handle);
+	};
+
 	// Constructor
 
 	var Sprite = function(el, frames, options){
@@ -106,7 +187,7 @@
 			};
 
 			isPlaying = true;
-			animationTick = window.setInterval(spriteTickHandler, 1000/playOptions.fps);
+			animationTick = window.requestInterval(spriteTickHandler, 1000/playOptions.fps);
 			return this;
 		};
 
@@ -127,7 +208,7 @@
 			var that = this;
 			callback = callback || $.noop;
 
-			window.clearInterval(animationTick);
+			window.clearRequestInterval(animationTick);
 			isPlaying = false;
 
 			if (frame && !animated) {
diff --git a/sprite.min.js b/sprite.min.js
index 351f15c..67b6af7 100644
--- a/sprite.min.js
+++ b/sprite.min.js
@@ -1,5 +1,6 @@
 /*
  * Sprite
+ * Anton Ball
  * @license
  */
-!function(glob){"use strict";var version="0.0.1";var convertToFramePoints=function(frameObject,numFrames){var result=[];for(var i=0;i<numFrames;i+=1){result.push([i*frameObject.width,0,frameObject.width,frameObject.height])}return result};var Sprite=function(el,frames,options){var isPlaying=false,currentFrame=0,framePoints,animationTick,tickCount;this.el=el;this.options=$.extend({},Sprite.defaults,options);this.numFrames=frames.length?frames.length:Math.floor(options.imageWidth/frames.width)*Math.floor(options.imageHeight/frames.height);framePoints=$.isPlainObject(frames)?convertToFramePoints(frames,this.numFrames):frames;var updateFrame=function(frame){$(this.el).css("background-position",-frame[0]+"px "+-frame[1]+"px")};this.isPlaying=function(){return isPlaying};this.frame=function(num){if($.isNumeric(num)&&currentFrame!==num){currentFrame=num<this.numFrames?num:currentFrame;updateFrame.call(this,framePoints[currentFrame])}return currentFrame};this.play=function(options){if(isPlaying){return this}var playOptions=$.extend({onComplete:$.noop,onFrame:$.noop},this.options,options),that=this,playFrames=playOptions.reverse?framePoints.slice(0).reverse():framePoints,loopCount=0;tickCount=0;currentFrame=this.frame(playOptions.from||currentFrame);var spriteTickHandler=function(){updateFrame.call(that,playFrames[currentFrame]);currentFrame=(currentFrame+=1)%that.numFrames;playOptions.onFrame.call(that,currentFrame,loopCount);if(currentFrame===0){loopCount+=1;if(!playOptions.loop||loopCount===playOptions.loop){that.stop();playOptions.onComplete.call(that)}}tickCount+=1};isPlaying=true;animationTick=window.setInterval(spriteTickHandler,1e3/playOptions.fps);return this};this.stop=function(frame,animated,callback){if(!isPlaying){return this}var that=this;callback=callback||$.noop;window.clearInterval(animationTick);isPlaying=false;if(frame&&!animated){this.frame(frame)}else if(frame&&animated){this.play({from:currentFrame,onFrame:function(currentFrame){if(frame===currentFrame){that.stop();callback.call(that)}}})}return this}};Sprite.toString=function(){return"Sprite version "+this.version};Sprite.version=version;Sprite.defaults={fps:12,loop:true,reverse:false};glob.Sprite=Sprite}(this);
\ No newline at end of file
+!function(glob){"use strict";var version="0.0.1";var convertToFramePoints=function(frameObject,numFrames){var result=[];for(var i=0;i<numFrames;i+=1){result.push([i*frameObject.width,0,frameObject.width,frameObject.height])}return result};!function(){var lastTime=0,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(),timeToCall=Math.max(0,16-(currTime-lastTime)),id=window.setTimeout(function(){callback(currTime+timeToCall)},timeToCall);lastTime=currTime+timeToCall;return id}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(id){clearTimeout(id)}}}();window.requestInterval=function(fn,delay){if(!window.requestAnimationFrame&&!window.webkitRequestAnimationFrame&&!(window.mozRequestAnimationFrame&&window.mozCancelRequestAnimationFrame)&&!window.oRequestAnimationFrame&&!window.msRequestAnimationFrame)return window.setInterval(fn,delay);var start=(new Date).getTime(),handle={};function loop(){handle.value=requestAnimationFrame(loop);var current=(new Date).getTime(),delta=current-start;if(delta>=delay){fn.call();start=(new Date).getTime()}}handle.value=requestAnimationFrame(loop);return handle};window.clearRequestInterval=function(handle){window.cancelAnimationFrame?window.cancelAnimationFrame(handle.value):window.webkitCancelAnimationFrame?window.webkitCancelAnimationFrame(handle.value):window.webkitCancelRequestAnimationFrame?window.webkitCancelRequestAnimationFrame(handle.value):window.mozCancelRequestAnimationFrame?window.mozCancelRequestAnimationFrame(handle.value):window.oCancelRequestAnimationFrame?window.oCancelRequestAnimationFrame(handle.value):window.msCancelRequestAnimationFrame?window.msCancelRequestAnimationFrame(handle.value):clearInterval(handle)};var Sprite=function(el,frames,options){var isPlaying=false,currentFrame=0,framePoints,animationTick,tickCount;this.el=el;this.options=$.extend({},Sprite.defaults,options);this.numFrames=frames.length?frames.length:Math.floor(options.imageWidth/frames.width)*Math.floor(options.imageHeight/frames.height);framePoints=$.isPlainObject(frames)?convertToFramePoints(frames,this.numFrames):frames;var updateFrame=function(frame){$(this.el).css("background-position",-frame[0]+"px "+-frame[1]+"px")};this.isPlaying=function(){return isPlaying};this.frame=function(num){if($.isNumeric(num)&&currentFrame!==num){currentFrame=num<this.numFrames?num:currentFrame;updateFrame.call(this,framePoints[currentFrame])}return currentFrame};this.play=function(options){if(isPlaying){return this}var playOptions=$.extend({onComplete:$.noop,onFrame:$.noop},this.options,options),that=this,playFrames=playOptions.reverse?framePoints.slice(0).reverse():framePoints,loopCount=0;tickCount=0;currentFrame=this.frame(playOptions.from||currentFrame);var spriteTickHandler=function(){updateFrame.call(that,playFrames[currentFrame]);currentFrame=(currentFrame+=1)%that.numFrames;playOptions.onFrame.call(that,currentFrame,loopCount);if(currentFrame===0){loopCount+=1;if(!playOptions.loop||loopCount===playOptions.loop){that.stop();playOptions.onComplete.call(that)}}tickCount+=1};isPlaying=true;animationTick=window.requestInterval(spriteTickHandler,1e3/playOptions.fps);return this};this.stop=function(frame,animated,callback){if(!isPlaying){return this}var that=this;callback=callback||$.noop;window.clearRequestInterval(animationTick);isPlaying=false;if(frame&&!animated){this.frame(frame)}else if(frame&&animated){this.play({from:currentFrame,onFrame:function(currentFrame){if(frame===currentFrame){that.stop();callback.call(that)}}})}return this}};Sprite.toString=function(){return"Sprite version "+this.version};Sprite.version=version;Sprite.defaults={fps:12,loop:true,reverse:false};glob.Sprite=Sprite}(this);
\ No newline at end of file
diff --git a/tests/spec/SpriteSpec.js b/tests/spec/SpriteSpec.js
index 13c468d..4561750 100644
--- a/tests/spec/SpriteSpec.js
+++ b/tests/spec/SpriteSpec.js
@@ -145,7 +145,7 @@ describe('Actual run of play', function(){
 	});
 
 	it('Play is running', function(){
-		// sprite.play();
+		sprite.play();
 		// sprite.play({fps: 12, from: 10});
 		// sprite.play({fps: 12, loop: false});
 		// sprite.play({fps: 10, from: 22}); // There is no 22