I've been experiencing this problem in Lenny myself. I use unencrypted,
remote X, using XDMCP to establish a connection. I find particular
problems when using Evolution - it's unusable to scroll the lists. I
also experience slow performance using X tunneled via ssh.
I've applied Stephane Graber's
a patch reported upstream seems to resolve the issue for some LTSP users
(haven't confirmed myself):
http://bugs.freedesktop.org/show_bug.cgi?id=17868
http://bugs.freedesktop.org/attachment.cgi?id=26071
diff --git a/src/xcb_util.c b/src/xcb_util.c
index 4ae9097..8873f26 100644
---
Package: libx11-6
Version: 2:1.1.4-2
Severity: important
Since upgrading libx11-6 in lenny from 1.0.3 to 1.1.4 we're seeing
severe performance degradation when using applications over a remote
ssh X11 forwarding tunnel. The applications we've seen this happen to
are: netbeans 6.0, icedove,
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