title: Opera Out Of memory error with Canvas / kinetic
body: <p>I have a script which I have built using requestAnimationFrmae. </p>
  
  <p><a href="http://pastebin.com/qbACkxS3" rel="nofollow">Code on pastebin here</a></p>
  
  <p>In chrome it works beautifully. Smooth and perfect. 
  However in FF, Opera and Safari its teribbly jerky. </p>
  
  <p>I have a statement which works out if the browser can handle requestAnimationFrame and if it can't resorts back to timeOut()</p>
  
  <p>Can anyone tell me / see why this is so poor / Jerky. And how I can improve the performance.</p>
  
  <p>Thanks.</p>