title: Animating a PNG file in flash CPU
body: <p>I have a PNG file 1024 x 768. On top of that I have other smaller PNG files that "slide in" (only moving along the x and y) via an ENTER_FRAME handler?</p>
  
  <p>I was just wondering, do animating PNGS require more CPU than say, basic vector shapes? Is there anything I could do to optimize my animation?</p>
  
  <p>It's literally like:</p>
  
  <pre><code>private function onEnterFrame(e:Event):void {
    myPng.x += speed; // and so on
  }
  </code></pre>
  
  <p>Also, if I place the PNG inside of a MovieClip, should I set the MovieClip "cacheAsBitmap" to true or is that implied if I put a PNG file in it??</p>