title: Appropriate use of CCTextureCache
body: <p>I'm currently creating a <code>CCSprite</code> like this:</p>
  
  <pre><code>CCSprite *s = [CCSprite spriteWithFile:@"image.png"];
  </code></pre>
  
  <p>This sprite is the background image of a <code>CCLayer</code> that's used relatively often. Is the following use of <code>CCTextureCache</code> more efficient?</p>
  
  <pre><code>CCTexture2D *t = [[CCTextureCache sharedTextureCache] addImage:@"image.png"];
  CCSprite *s = [CCSprite spriteWithTexture:t];
  </code></pre>