title: Using system cache of UIImage objects with images loaded from disk cache (NSCachesDirectory)?
body: <p>I'm trying to improve scrolling performance on a <code>UITableView</code> that uses cells with images fetched from the web, but stored in the <code>NSCachesDirectory</code>. The cells have a custom content view to draw the contents (an image).</p>
  
  <p>When I use a placeholder image from the app bundle, using <code>[UIImage imageNamed:@"Placeholder.png"]</code>, scrolling performance is super fast.</p>
  
  <p>When I load an image from the disk cache (<code>NSCachesDirectory</code>) using <code>[UIImage imageWithContentsOfFile:cachePath]</code>, scrolling performance gets worse.</p>
  
  <p>According to the documentation, <code>imageNamed:</code> caches the image and <code>imageWithContentsOfFile:</code> does not.</p>
  
  <p>How to use <code>UIImage</code>'s system cache when using <code>imageWithContentsOfFile:</code> ?</p>
  
  <p>Thanks a bunch!</p>