One of my desktop response too slowly.

[rich.bae]

Hi there.

First, I'd like to sorry for my poor English.

I'm using dual monitor with nvidia 8600gt graphic card which has one dvi and one of d-sub connector.
dvi is connected with 21 inches LCD monitor and d-sub is connected with 17 inches LCD monitor.
and my PC has been composed with Core2 Duo 2.4GHz CPU, 3G RAM and 300G HDD.

My problem is on 17 inches LCD monitor. it is configured as Screen 0 means 0:0.
Unlike 0:1 screen, its reaction against mouse click is too slow.
In screen 1(0:1), whenever I click anything, it shows fast result.
but screen 0(0:0) dose not. Whenever I click anything like menu or window, It starts reacting after about 1 second.
For more detail, When I click some of gtk components like buttons in a window, It is not so slow.
but When I click a menu to launch a new application like firefox and to show sub menu, they are so slow.
What's wrong with it?

Thank you for your concern in advance.

FYI, my xorg.conf like below.

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 1.0 (buildd@vernadsky) Tue Mar 4 20:24:34 UTC 2008

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 1600 0
Screen 1 "Screen1" LeftOf "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection

Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
EndSection

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection

Section "ServerFlags"
Option "Xinerama" "0"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection

Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Samsung SyncMaster"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection

Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor1"
VendorName "Unknown"
ModelName "XGE XGATE XG20SM"
HorizSync 30.0 - 82.0
VertRefresh 55.0 - 62.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 8600 GT"
BusID "PCI:1:0:0"
Screen 0
EndSection

Section "Device"
Identifier "Videocard1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 8600 GT"
BusID "PCI:1:0:0"
Screen 1
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "0"
Option "TwinViewXineramaInfoOrder" "CRT-0"
Option "metamodes" "CRT: 1280x1024_60 +0+0; CRT: 1280x1024 +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection

Section "Screen"
Identifier "Screen1"
Device "Videocard1"
Monitor "Monitor1"
DefaultDepth 24
Option "TwinView" "0"
Option "metamodes" "DFP: 1600x1200 +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection