Given the real-time nature of the game, on mobile devices, there are times - usually during intense gameplay activity - when the pinch-to-zoom and touch rotate controls will appear sluggish and unresponsive. We are aware of this and while there is nothing much that we can do at this time, we are constantly looking for ways in which to improve on the game. As such, if/when we find a solution that works better, we will release an update for the game on all affected platforms (iOS, Android).