title: Implementing NSRunLoop
body: <p>Ok, I've read the articles about why it's a better idea to use an NSRunLoop instead of an NSTimer call to run a game loop and maintain a nice frame rate.  </p>
  
  <p>But what I haven't seen in any of the discussions is where to create the NSRunLoop.</p>
  
  <p>Should that be put at the end of didFinishLoading?</p>