title: Frame rate drops after upgrading from cocos2d 1.x to 2.x
body: <p>I have recently upgraded to Cocos2d 2.0 Before that my game was working properly and frame rate was stably on 60fps. After upgrading to 2.0 and changing some code to the new version I have recognized that playing the game for about 3-4 minutes the frame rate drops down to 50, than to about 40.</p>
  
  <p>I have found some mistakes in my code, like deallocating wrongly some sprites, but this the FPS drop was still there.</p>
  
  <p>I am creating sprites and removing sprites continuously in the scene. After each round in the game I am removing the screen elements and creating them again for the new round. Almost all elements are animated and I am stopping all actions before removing them from the scene.</p>
  
  <p>I have found out that if I removing the scene and starting it again, the FPS rate comes back to normal.</p>
  
  <p>What I am doing wrong? I have tried several possible solutions, but I cannot find the route cause. </p>
  
  <p>Could anybody help here?</p>
  
  <p>Oh, I forgot to mention that the code was working fine on Cocos2d 1.x version. I have never recognized any FPS drop with the same code.</p>