title: UINavigationController pushViewController pauses/freezes midway through
body: <p>I am  pushing a view controller via:</p>
  
  <pre><code>[self.navigationController pushViewController:[[UIViewController alloc] init] animated:YES];
  </code></pre>
  
  <p>But the animation lags/pauses a for half a second mid way through. The animation is not complete. Here's the gif;</p>
  
  <p><img src="https://i.stack.imgur.com/RReP2.gif" alt="enter image description here"></p>