title: Scene freezes on particular action
body: <p>I'm beginner in cocos2d. I have different sprites, that each of them run some action, and animate. But I noticed, that when I'm trying to have some logic in Sequence of Actions, using <code>CCCalfFunc</code> and do some logic (change animation, position, etc.. ), it's freezing all actions on a screen for about a second. I guess it's blocking main thread but I wonder why it not decreasing frame rate? </p>
  
  <p>It's still 60 fps, but whenever I run that action and do logic, it keeps blocking for a second. <strong>My understanding was, that at worse scenario it would decrease frame rate, not freeze screen with actions.</strong> So what solution can be in this case? I don't want to use <code>NSOperation</code>, GDC, because I'm updating sprites animations, positions, etc...</p>
  
  <p>Thanks</p>