title: NSAttributedString freeze UITableView
body: <p>Application really freeze while scrolling with NSAttributedString (When I use NSString it works fine), so there my method:</p>
  
  <pre><code>- (void)setSubtitleForCell:(TTTableViewCell *)cell item:(TTPhotoPost *)item
  {
      NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:
                                              [item.caption dataUsingEncoding:NSUnicodeStringEncoding]
                                                                              options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType }
                                                                   documentAttributes:nil
                                                                                error:nil];
  
      [cell.descriptionLabel setAttributedText:attributedString];
  }
  </code></pre>
  
  <p>Any mistakes there? or some way to make att.string faster? </p>