 <p>While your pictures are fairly large and you should try to reduce the number and size, you can make gains through packaging the .png into pvr.ccz files. There are multiple different programs available to do this. I like to use Texture Packer which is available here: <a href="http://www.codeandweb.com/texturepacker" rel="nofollow">http://www.codeandweb.com/texturepacker</a></p>