title: Xcode Instruments Core Animation Always keeps 60 FPS
body: <p>I am using iPhone5s and iPad mini (both iOS8.1.1).　Even if I don't do any action (touching screen or scrolling pages...) and using any App in iPhone5s,Core Animation always shows around 60 fps.<br>
  But When I do same measurement in iPad mini,Core Animation operated correctly.</p>
  
  <p>Is this iPhone5s's problem in software or hardware ? </p>