title: Do you put NSFetchRequest into cellForRowAtIndexPath?
body: <p>It seems me somewhat slow to perform <code>NSFetchRequest</code> in <code>cellforRowAtIndexPath</code>.</p>
  
  <p>How do you treat it? Is it more memory / time efficient to perform it in <code>viewDidLoad</code>, cache result into a dictionary, and use that in <code>cellForRowAtIndexPath</code>?</p>