bad redrawing performance

[Stephen J. Turnbull]

Neal Becker writes:

 > I'm playing with dxpc (differential x compression).  I find that xemacs
 > (21.5.27) behaves terribly.  For example, M-x shell, then run say, 'ps aux'
 > redraws over and over.

Please submit a full bug report.  For starters, there are at least
three different display engines (Xlib, Xft, and GTK+) available on X,
so a copy of Installation would be useful.  Presence of widgets and
dialogs can affect redisplay, too.  It's very complex.

It would also be nice to know *what* is being redrawn, exactly.