Thanks for your comments Mark.  I worked with Scott Balnaeves in #ltsp
and he ported the old X_RAMPERC from LTSP4 to LTSP5 for me.  I did post
the instructions for implementing X_RAMPERC to the edubuntu-users list
(didn't think of posting here) https://lists.ubuntu.com/archives
/edubuntu-users/2007-September/thread.html#1850 (There needs to be some
changes to lts.conf as well, In playing I found that setting
X_RAMPERC=80 to be about the best) .  Firefox is also doing a ton of
work on this some of which can be referenced in these two bug posts:

https://bugzilla.mozilla.org/show_bug.cgi?id=395260
https://bugzilla.mozilla.org/show_bug.cgi?id=296818

Good news is that it looks like Firefox 3 will have a bunch more
features to work with pixmap cache and be very easy to tailor to thin
clients, but that is out a few months yet.

I also brought this up on the xorg mailing list in this thread:

http://lists.freedesktop.org/archives/xorg/2007-September/thread.html#28477

This is also a problem with xorg in the fact that it should not let any
client consume it's resources and crash.  The thread has a bunch of good
thoughts on future improvements, though I don't think they have decided
to make any permanent changes (Other apps can crash Xorg as well such as
OpenOffice, so more than just FF needs a fix).

Also here is the thread that started things on edubuntu-users:

https://lists.ubuntu.com/archives/edubuntu-
users/2007-September/thread.html#1825

Sorry I forgot about this bug report and did not post back any of the
progress.  Also it should be noted that this is not a problem specific
to Ubuntu, but all Linux distributions running Firefox, and also to a
handful of other apps when running under xorg.

Jim

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Firefox caches pixmaps to X11, need feature to disable
https://bugs.launchpad.net/bugs/137764
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