I can confirm this problem, but I do not have XGL installed.  I am using
Ubuntu 7.10, nvidia 7800.  Desktop effects are disabled.  I have
recorded a video to illustrate the difference:

http://upvector.com/kate_slow.avi

Kate is on the right (obviously).  It is essentially unusable, as are
all of the other KDE apps I use.

Notes:
- I am using the a driver downloaded from nvidia manually, installed with Envy 
(I am new to this Envy thing).  While I typically downloaded the nvidia drivers 
in Ubuntu 7.04 as well, I always installed them using their provided installer 
only.  Unfortunately, the restricted nvidia driver provided in the repositories 
incorrectly detects and sets my 1920x1200 display to 1600x1200, even if I 
manually "force" it to use 1920x1200 in various ways, but that's another issue 
for another bug.
- Kate was quite fast in the time I've been using Ubuntu prior to 7.10, from 
5.04 to 7.04.
- While Gtk-based applications seem to be generally slower than they were in 
7.04 (I have no data to back that up), they all run at a usable speed, unlike 
Kate and other KDE applications.

-- 
kde apps draw very slowly
https://bugs.launchpad.net/bugs/137401
You received this bug notification because you are a member of Kubuntu
Team, which is a bug contact for kdebase in ubuntu.

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