I have had installed every latest driver just as from Debian/testing repo just so from official Nvidia download server. 275.28, 280.13, latest beta.
No one of them resolves the problem with a slow interface responce. I have understood that something was broken in latest Xorg and that made the driver like there is no acceleration at all.
May I assume that need fix of that is obvious?
Nouveau isn't the case because the permanently full-throttled fan in a notebook is really bad.
Thinking of double-posting into http://www.nvnews.net/vbulletin/showthread.php?t=166698
but hope it's enough to stay it here.
GeForce 8600M GS on Acer Aspire 5520G.
X.Org X Server 1.11.1 (Release Date: 2011-09-24)
Build Operating System: Linux 3.1.0-rc4-amd64 x86_64 Debian
Current Operating System: Linux heaven 3.0.0-1-amd64 #1 SMP Sat Aug 27 16:21:11 UTC 2011 x86_64