> Now, while I suspect that some time could be saved by ignoring
> damaged rectangles that were completely offscreen, those results
> are not too shabby in my view. Are you seeing radically different numbers?

I have a very sparse Morph, like a diagonal line or a hollow polygon that
occupies a substantial part of the screen.  Can I declare a list of smaller
dirty rectangles in order to speed up World redraw?

-david