How big is the file? I know some image hosts don't like medium to large GIF files.
Could be a WiiHacks thing though, as I've tried to post animated GIFs, and some of them
would work, and some of them don't. But they look and work fine when looking at them
on my image host.
Oh, nearly forgot to say nice work there mate lol. If you do manage to speed it up, it'll look fantastic.