Under Slackware, Xorg 6.9 didn't have such a bad memory use.  Going to
5.10 Ubuntu, Xorg 6.8's listed memory went up (and my computer touched
swap a lot more).  Dapper's Xorf 7.00 fixed this some, but a recent
upgrade to a Xinerama setup has made the situation a whole lot worse.
Top will show that between Kopete, Mozilla, FireFox, and Thunderbird,
I'll have about 287mb of RAM used.  Xorg will be consuming 1.2gb!
Xrestop shows that Mozilla shares 250mb of pixmaps.  Closing FireFox,
Thunderbird, etc, removes them from the xrestop listings, but Xorg
itself still consumes multiple gigabytes of RAM:

top:
 7741 root      16   0 9429 1830m 987m  67m ..8.21.. S 32.7 48.8  29:30 Xorg
 7959 dylang    15   0  809  198m 130m  75m ..8.2... S  0.0  6.4   1:53 
mozilla-bin
 7909 dylang    15   0  663  119m  55m  20m ..8.2.4. S  0.0  2.7   1:44 kopete

xrestop:
res-base Wins  GCs Fnts Pxms Misc   Pxm mem  Other   Total   PID Identifier
3c00000   608   70  154 1504 1100   246466K    195K 246662K   ?   Bug #39825 in 
firefox (Ubuntu): [EMAIL PROTECTED] [EMAIL PROTECTED] - Mozilla
1400000   174  246    3  804 1278    34248K     42K  34291K   ?   KDE Desktop

I'm running 2 monitors in Xinerama for a total of 3520x1200 24-bit.

** Attachment added: "Xinerama config."
   http://librarian.launchpad.net/3149398/xorg.conf

-- 
Memory leak?
https://launchpad.net/bugs/39825

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