From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Double buffering graphics
From: rog@vitanuova.com
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Date: Thu, 30 May 2002 21:10:43 +0100
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> Writes from normal memory to video memory
> are very fast.  The reverse operation is very slow
> (I've seen faster 5400rpm disks).

is it this that causes the big slowdown when
part of a window is off screen?