title: UIView based animation
body: <p>I'm trying to animate some UIImageViews for a 2D game. Using [UiView begin/commit animation] is out of the question, since I need to determine the positions of all Image Views at all times. Instead I'm changing the frame.origin.x/y in my UIImageViews to manualy control my animations. My problem is that the framerate drops significantly for high numbers of UIImageViews or if their size is too large (btw, the UIImageViews contain PNGs with transparency colours). Do you have any optimization advices?</p>
  
  <p>Thanks</p>