ActionScript 3.0 :: Flash Make Duplicate Display Of Webcam Feed

I'm trying to write some apps that will include some image processing for facial, object recognition. There's a ton of stuff out there (mostly from 2009) that doesn't work very well and I want to give it a try.

Anyway, I have the webcam feeding a video object I've addChild()ed to the stage and that works aces. I want to make a copy of that video stream and plop it on the stage right next to it. This works, but the framerate suffers:

Code:
public function update(event):void
{
//onEnterFrame
var bmp:BitmapData = new BitmapData(_video.width/5,_video.height/5);

[Code]....

So this puts a pixelated version of the webcam feed right next to it just like I wanted, but it seems to lug down the processor. Logic would tell me that I'm piling on infinate amounts of "goat" to my movieClip (mc). I try to dispose() the bmp, but then it stops working.