Very bad performance on X11

[vincent esteoule]

Hello,
My  new server is very performant in local mode, butthe  response time of
X11 client  are very very bad. It's  a 5.8 RHED server.
 HP gen 8 with Sandy bridge E5 2665 proc and MGA Matrix G200 EH video card.
I have verify the version of driver, it's OK.
The X11 etc/X11 log contains
X -query localhost :1

X Window System Version 7.1.1
Release Date: 12 May 2006
X Protocol Version 11, Revision 0, Release 7.1.1
Build Operating System: Linux 2.6.18-274.12.1.el5 x86_64 Red Hat, Inc.
Current Operating System: Linux pollux.cryospace.fr 2.6.18-308.el5 #1 SMP
Fri Jan 27 17:17:51 EST 2012 x86_64
Build Date: 05 January 2012
Build ID: xorg-x11-server 1.1.1-48.90.el5
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.1.log", Time: Fri Sep 21 15:56:02 2012
(==) Using config file: "/etc/X11/xorg.conf"
(WW) MGA(0): Failed to set up write-combining range (0xf5000000,0x800000)
(WW) MGA(0): Failed to set up write-combining range (0xf57e0000,0x10000)
(WW) MGA(0): Failed to set up write-combining range (0xf57c0000,0x30000)
(WW) MGA(0): Failed to set up write-combining range (0xf5780000,0x70000)
(WW) MGA(0): Failed to set up write-combining range (0xf5700000,0xf0000)
(WW) MGA(0): Failed to set up write-combining range (0xf5600000,0x1f0000)
(WW) MGA(0): Failed to set up write-combining range (0xf5400000,0x3f0000)
(WW) MGA(0): Failed to set up write-combining range (0xf5000000,0x7f0000)
(WW) MGA(0): Failed to set up write-combining range (0xf57e0000,0x10000)
(WW) MGA(0): Failed to set up write-combining range (0xf57c0000,0x30000)
(WW) MGA(0): Failed to set up write-combining range (0xf5780000,0x70000)
(WW) MGA(0): Failed to set up write-combining range (0xf5700000,0xf0000)
(WW) MGA(0): Failed to set up write-combining range (0xf5600000,0x1f0000)
(WW) MGA(0): Failed to set up write-combining range (0xf5400000,0x3f0000)
(WW) MGA(0): Failed to set up write-combining range (0xf5000000,0x7f0000)
(EE) MGA(0): [drm] Direct rendering only supported with G200/G400/G450/G550.
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning:          Multiple symbols for level 1/group 1 on key <I5F>
>                   Using XF86Sleep, ignoring XF86Standby
> Warning:          Symbol map for key <I5F> redefined
>                   Using last definition for conflicting fields
Errors from xkbcomp are not fatal to the X server

I' am not a LINUX specialist. Can somebody can show me the direction to
search the solution  version of X11, Red Hat, HP...
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