In our app, we use a customized UIViewController managing a UICollectionView for loading a stream of messages. However, we noticed poor scroll performance. On time profiling, we noticed that [UICollectionView dequeReusableCell..] call takes over 35% of the time, most of which is due to a UICollectionViewAccessibility call.
Instruments Time Profiler snapshot: http://i.stack.imgur.com/GLB49.png
Has anyone experienced similar problems before collection view? This was on an iOS8.1 iPhone 5s simulator with Accessibility options turned off.