Circles & cacheAsBitmap

[SWF(width=600,height=400,backgroundColor=0x000000,frameRate=30)]
var mcs:Vector.<MovieClip> = new Vector.<MovieClip>();
var num:int = 2000;
for (var i:int = 0; i<num; i++){
	var s:MovieClip = new MovieClip();
	s.graphics.lineStyle(0,0xFFFFFF);
	s.graphics.drawCircle(0,0, Math.random()*30 + 3);
	s.x = Math.random()*stage.stageWidth;
	s.y = Math.random()*stage.stageHeight;
       // comment out to kill your cpu
	s.cacheAsBitmap = true;
	addChild(s);
	s.vx  = Math.random() * 2 - 1;
	s.vy  = Math.random() * 2 - 1;
    mcs.push(s);
}
addEventListener(Event.ENTER_FRAME, onCenter);
function onCenter(evt:Event):void{
	for (var i:int = 0; i<num; i++){
		mcs[i].x += mcs[i].vx;
		mcs[i].y += mcs[i].vy;
	}
}

This was created in response to a question about the real speed gain of cacheAsBitmap. Just comment out the cacheAsBitmap line to see the difference.

Despite it’s extreme simplicity, this is actually a rather fun file to play with, change some of the graphics class method calls around and see what happens.