diff --git a/demo/assets/js/perf.js b/demo/assets/js/perf.js
deleted file mode 100644
index 4c7723d..0000000
--- a/demo/assets/js/perf.js
+++ /dev/null
@@ -1,178 +0,0 @@
-//returns browser prefix
-function getPrefix() { 
-	var div = document.createElement('div'), i = 0,	pf = ['Moz', 'moz', 'Webkit', 'webkit', 'O', 'o', 'Ms', 'ms'], pl = pf.length,
-		s = ['MozTransform', 'mozTransform', 'WebkitTransform', 'webkitTransform', 'OTransform', 'oTransform', 'MsTransform', 'msTransform'];
-		
-	for (i; i < pl; i++) { if (s[i] in div.style) { return pf[i]; }	}
-	div = null;
-}
-
-// generate a random number within a given range
-function random(min, max) {
-	return Math.random() * (max - min) + min;
-}
-
-// vendor prefix handle 
-var prefix = getPrefix(), // prefix
-	prefixRequired = (!('transform' in document.getElementsByTagName('div')[0].style)) ? true : false, // is prefix required for transform
-	transformProperty = prefixRequired ? prefix + 'Transform' : 'transform';
-
-// the variables
-var container = document.getElementById('container'),
-	easing = 'easingQuadraticInOut',
-	tweens = [];
-		
-function createTest(count, property, engine, repeat, hack) {
-	for (var i = 0; i < count; i++) {
-		var tween,
-			div = document.createElement('div'),
-			windowHeight = document.documentElement.clientHeight - 10,
-			left = random(-200, 200),
-			toLeft = random(-200, 200),
-			top = Math.round(Math.random() * parseInt(windowHeight)),
-			background = 'rgb('+parseInt(random(0, 255))+','+parseInt(random(0, 255))+','+parseInt(random(0, 255))+')',
-			fromValues, toValues, fn = i===count-1 ? complete : null;
-			repeat = parseInt(repeat);
-			
-		div.className = 'line';
-		div.style.top =  top + 'px';
-		div.style.backgroundColor = background;
-		
-		if (property==='left') {
-			div.style.left = left + 'px';
-			if (hack) { div.className += ' hack'; }
-			fromValues = engine==="tween" ? { left: left, div: div } : { left: left };
-			toValues = { left: toLeft }
-		} else {
-			div.style[transformProperty] = 'translate3d('+left + 'px,0px,0px)';
-			if (engine==="kute"){
-				fromValues = { translateX: left }
-				toValues = { translateX: toLeft }
-			} else if ((engine==="gsap") || (engine==="tween")) {
-				fromValues = engine==='gsap' ? { x: left } : { x: left, div : div }
-				toValues = { x: toLeft }				
-			}
-		}
-		
-		container.appendChild(div);
-	
-		// perf test
-		if (engine==='kute') {
-			tween = KUTE.fromTo(div, fromValues, toValues, { delay: 100, easing: easing, repeat: repeat, yoyo: true, duration: 1000, complete: fn });
-			tweens.push(tween);
-		} else if (engine==='gsap') {
-			if (property==="left"){
-           		tween = TweenMax.fromTo(div, 1, fromValues, {left : toValues.left, repeat : repeat, yoyo : true, ease : Quad.easeInOut, onComplete: fn });							
-			} else {
-          		tween = TweenMax.fromTo(div, 1, fromValues, { x:toValues.x, repeat : repeat, yoyo : true, ease : Quad.easeInOut, onComplete: fn });							
-			}
-		} else if (engine==='tween') {
-			var update; 			
-			
-			if (property==="left"){
-				update = function(){
-					this.div.style['left'] = this.left+'px';
-				}					
-			} else if (property==="translateX"){
-				update = function(){
-					this.div.style[transformProperty] = 'translate3d('+this.x + 'px,0px,0px)';
-				}
-			}			
-			
-			tween = new TWEEN.Tween(fromValues)
-				.to(toValues,1000)
-				.easing( TWEEN.Easing.Quadratic.InOut )
-				.onComplete( complete )
-				.onUpdate( update)
-				.repeat(repeat)
-				.yoyo(true);
-			tweens.push(tween);		
-		}
-	}
-	if (engine==='tween') {
-		animate();
-		function animate( time ) {
-			requestAnimationFrame( animate );
-			TWEEN.update( time );
-		}
-	}	
-	
-	// since our engines don't do sync, we make it our own here
-	if (engine==='tween'||engine==='kute') {
-		var now = window.performance.now();
-		for (var t =0; t<count; t++){
-			tweens[t].start(now+count/16)
-		}	
-	}
-}
-
-function complete(){
-	document.getElementById('info').style.display = 'block';
-	container.innerHTML = '';
-	tweens = [];
-}
-
-//some button toggle 
-var btnGroups = document.querySelectorAll('.btn-group'), l = btnGroups.length;
-
-for (var i=0; i<l; i++) {
-	var g = btnGroups[i], links = g.querySelectorAll('a'), ll = links.length; 
-	for (var j=0; j<ll; j++) {
-		links[j].onclick = function() {
-			var link = this, b = link.parentNode.parentNode.parentNode.querySelector('.btn');
-			b.innerHTML = link.id.toUpperCase() + ' <span class="caret"></span>';
-			b.setAttribute('data-'+link.parentNode.parentNode.parentNode.id,link.id);
-			if ( /LEFT/.test(document.getElementById('property').querySelector('.btn').innerHTML) ) {
-				document.getElementById('hack').style.display = 'block';
-			} else {
-				document.getElementById('hack').style.display = 'none';
-			}
-		}
-	}
-}
-
-document.getElementById('hack').querySelector('.btn').onclick = function(){
-	var self= this;
-	setTimeout(function(){
-		if ( !self.querySelector('INPUT').checked ) {
-			self.className = self.className.replace('btn-info','btn-warning');			
-			self.querySelector('.state').innerHTML = 'Hack ON';
-		} else if ( self.querySelector('INPUT').checked ) {
-			self.className = self.className.replace('btn-warning','btn-info');
-			self.querySelector('.state').innerHTML = 'Hack OFF';
-		}		
-	},200)
-}
-
-// the start  button handle
-document.getElementById('start').onclick = function(){
-	var c = document.querySelector('[data-count]'),	e = document.querySelector('[data-engine]'), r = document.querySelector('[data-repeat]'),
-		p = document.querySelector('[data-property]'),	ct = c && document.querySelector('[data-count]').getAttribute('data-count'), 
-		count = ct ? parseInt(ct) : null,
-		engine = e && document.querySelector('[data-engine]').getAttribute('data-engine') || null,
-		repeat = r && document.querySelector('[data-repeat]').getAttribute('data-repeat') || null,
-		property = p && document.querySelector('[data-property]').getAttribute('data-property') || null,
-		hack = document.getElementById('hack').getElementsByTagName('INPUT')[0].getAttribute('checked') ? true : false,
-		warning = document.createElement('DIV');
-		
-	warning.className = 'text-warning padding lead';
-	container.innerHTML = '';	
-	if (count && engine && property && repeat) {
-		document.getElementById('info').style.display = 'none';
-		
-		createTest(count,property,engine,repeat,hack);
-	} else {
-
-		if (!count && !property && !repeat && !engine){
-			warning.innerHTML = 'We are missing all the settings here.';
-		} else {
-			warning.innerHTML = 'Now missing<br>';
-			warning.innerHTML += !engine ? '- engine<br>' : ''; 
-			warning.innerHTML += !property ? '- property<br>' : '';
-			warning.innerHTML += !repeat ? '- repeat<br>' : ''; 
-			warning.innerHTML += !count ? '- count<br>' : ''; 
-		}
-		
-		container.appendChild(warning);
-	}
-}
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