maybe Doc Geeps background tutorial might have some tips, I'm at work and can't check at the moment (by time, not content. It's family-freindly). You trade detail for speed, so the more information in each frame, the slower (and more memory-hogging) the movie gets.

Be interested in seeing the results, tho...

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)