title: RestKit Makes UI Unresponsive
body: <p>I'm using RestKit version 0.2 and I'm seeing it block the UI (meaning, the UI becomes choppy/unresponsive) when I call RKRequestOperation as follows:</p>
  
  <pre><code>- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
  NSString *urlString = [NSString stringWithFormat:@"http://localhost:8080/models?offset=%d&amp;rows=%d", _offset, _numRows];
      NSURL *url = [NSURL URLWithString:urlString];
      NSURLRequest *request = [NSURLRequest requestWithURL:url];
      RKObjectRequestOperation *operation = [[RKObjectRequestOperation alloc] initWithRequest:request responseDescriptors:@[_responseDescriptor]];
      [operation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *result) {
          NSLog(@"Got models: %@", [result array]);
          [self addModelsToView:[results array]];
      } failure:^(RKObjectRequestOperation *operation, NSError *error) {
          NSLog(@"FAILED!");
      }];
  
      [operation start];
  }
  </code></pre>
  
  <p>A bit more background:</p>
  
  <p>I'm doing this to load new model views into an infinite <code>UIScrollView</code>. I detect when the user scrolls to the bottom of the view (coordinate logic redacted), use RestKit as above to load the next set of views, and when the models return I load them into the scroll view in <code>addModelsToView</code>. Even when I comment out <code>addModelsToView</code>, the choppy logic remains, so I'm certain it's something to do with RestKit (or how I'm using it, at least).</p>
  
  <p>From what I understand about RestKit is that it does load asynchronously, so I'm having trouble finding why/where the choppyness is occurring. </p>
  
  <p>Thanks in advance!</p>