title: UITableView cornerRadius with border performance issues on iOS
body: <p>I have some interesting notice with scrolling performance on <code>UITableView</code> with <code>cornerRadius</code>, <code>borderWidth</code> and <code>borderColor</code> enabled.</p>
  
  <pre><code>self.tableView.layer.cornerRadius = 10.f;
  self.tableView.layer.borderWidth = 1.0f;
  self.tableView.layer.borderColor = [UIColor whiteColor].CGColor;
  </code></pre>
  
  <p>If I remove <code>borderWidth</code> and <code>borderColor</code> than scrolling gets 60 FPS no problem. As long as I add those two properties to layer FPS drops.</p>
  
  <p>Does anyone have a suggestion or explanation why this strange behavior happens?</p>
  
  <p>Many Thanks!</p>