But as a matter of fact it does! The video card takes quite long to get the
image displayed. If Director too took so long, then you wouldn't get stair
steps, but a gradient (which would be fine, because you wouldn't notice
it!). You see stair steps, BECAUSE Director is so fast.


This bit sounds misleading. The switching to the other buffer is probably instant, but that doesn't mean Director is fast. The tearing you see isn't because Director is fast or slow, but because the switching happens in the middle of a screen refresh.

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