The problem about fps 
<p>I have created a project . 
and there are three groups of images need to display , and every group has 5 images .
In the app , the image will be changed once per 0.2 seconds . 
and the size of the image is only 30*30 , so there are about 80 images on screen , they all have the animation . 
But when I test this , I feel the fps seems become 0.8 seconds , it was very slow .</p>

<p>All the images are drawn in ONE UIView . I use [image drawInRect:] in the method -(void)drawRect . 
So is there any suggestions for me to make the fps more faster ?</p>
