David,

> You can create the images on a secondary thread, then pass them back to the 
> main thread for assignment. The heavy operation is the drawing, not the 
> uploading of drawn content. You may also want to consider culling some of 
> that data before you draw it.

You're right. Up to that point, I'm quite satisfied with generating the 
contents directly out of the delegate, but, in a sense, your approach is more 
unified, since the same layer could then display either vector (drawn out of 
the database) or raster contents.

Also, there is no possibility to make the drawing be continuous? At that point, 
the tiles pop out of the void when the drawing is over. No way to make the 
drawing dynamic?

Thanks,
Vincent

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