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    <p>So i put together a solution for my question with the help of Andreas and adamh.</p> <p>Andreas - showed me that i forgot to dispose the bitmapdata (really nice spot!)</p> <p>Adamh - told me to define scrollrect on the canvas (Upped the performance a lot!)</p> <p>But what did it in the end and made the performance fluid, was a simple mistake from my side. I noticed in the particle.as > render(), that i was only checking if the particle was out of bounds on 2 sides (facepalm), stupid mistake. When i changed the render function to check the remaining 2 sides, it fixed the performance issue.</p> <p>Sorry for the stupid question :) and thanks again to Andreas and adamh</p> <p>the final classes:</p> <p><strong>FluidLayer.as</strong></p> <pre><code>package { import flash.display.Sprite; import flash.events.MouseEvent; import flash.display.BitmapData; import flash.filters.BlurFilter; import flash.display.Bitmap; import flash.geom.Point; import flash.geom.ColorTransform; import flash.display.IBitmapDrawable; import flash.events.Event; import flash.display.MovieClip; import flash.geom.Rectangle; public class FluidLayer extends MovieClip { private var canvas:Sprite; private var b:Bitmap; private var blur:BlurFilter = new BlurFilter(20,20,3); private var bmd1:BitmapData; public function FluidLayer() { canvas = new Sprite(); canvas.scrollRect = new Rectangle(0,0,1010,550); for(var i:int = 0;i &lt; 600;i++){ var p:Particle = new Particle(); canvas.addChild(p); p.x = stage.stageWidth * Math.random(); p.y = stage.stageHeight* Math.random(); p.initi(stage); } canvas.filters = new Array(blur); addEventListener(Event.ENTER_FRAME, render); } private function render(e:Event):void{ remove(); b = new Bitmap(makeFluid(canvas),"auto", true); b.alpha = 0.7; addChild(b); } private function makeFluid(o:Sprite):BitmapData{ bmd1 = new BitmapData(stage.stageWidth, stage.stageHeight, true); bmd1.draw(o,null,null,null,null,true); bmd1.threshold(bmd1, bmd1.rect, new Point(0,0), "&gt;", 0XFF2b2b2b, 0x55FFFF, 0xFFFFFF, false); return bmd1; } private function remove():void{ if(numChildren &gt; 1) removeChildAt(1); if(bmd1){ bmd1.dispose(); bmd1 = null; } }}} </code></pre> <p><strong>Particle.as</strong></p> <pre><code>package { import flash.display.MovieClip; import flash.events.Event; import flash.display.Stage; public class Particle extends MovieClip { private var speedX:int; private var speedY:int; private var _s:Stage; public function Particle() { this.graphics.beginFill(0x00CCFF); this.graphics.drawCircle(0,0,Math.random() * 30); speedX = Math.random() * 10 - 5; speedY = Math.random() * 10 - 5; this.addEventListener(Event.ADDED_TO_STAGE, initi); } public function initi(s:Stage):void{ this._s = s; addEventListener(Event.ENTER_FRAME, render); } private function render(e:Event):void{ this.x += Math.random()*speedX; this.y += Math.random()*speedY; if(this.x &gt; _s.stageWidth || this.y &gt; _s.stageHeight || this.x &lt; 0 &amp;&amp; this.y &lt; 0){ this.x = Math.random()*_s.stageWidth; this.y = Math.random()*_s.stageHeight; //removeEventListener(Event.ENTER_FRAME, render); //this.parent.removeChild(this); } } }} </code></pre>
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