title: viewDidAppear Delay
body: <p>I'm experiencing long delays (1-3 seconds) between the calls to viewWillAppear and viewDidAppear.</p>
  
  <p>This happens after loading a large view, sometimes printing wait_fences as well.
  No connection to UIAlertView or any of the other causes I see in related questions.</p>
  
  <p>There isn't anything going on in viewWillAppear, calling super and not performing any animations.</p>
  
  <p>What could be the reason for this long delay?</p>