我已经安装了带有专有 Radeon 驱动程序的 12.10，并将桌面扩展到三台显示器：
$ dpkg -l fg*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-================-=============-=============-======================================
ii fglrx 2:9.000-0ubun amd64 Video driver for the AMD graphics acce
ii fglrx-amdcccle 2:9.000-0ubun amd64 Catalyst Control Center for the AMD gr
un fglrx-amdcccle-u <none> (no description available)
un fglrx-control <none> (no description available)
un fglrx-control-qt <none> (no description available)
ii fglrx-dev 2:9.000-0ubun amd64 Video driver for the AMD graphics acce
un fglrx-driver <none> (no description available)
un fglrx-driver-dev <none> (no description available)
un fglrx-glx <none> (no description available)
un fglrx-kernel-sou <none> (no description available)
un fglrx-modaliases <none> (no description available)
un fglrx-updates <none> (no description available)
un fglrx-updates-de <none> (no description available)
$ cat /etc/X11/xorg.conf
Section "ServerLayout"
Identifier "aticonfig Layout"
Screen 0 "aticonfig-Screen[0]-0" 0 0
EndSection
Section "Module"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Monitor"
Identifier "0-DFP2"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "3840 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Monitor"
Identifier "0-DFP4"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "1920 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Monitor"
Identifier "0-DFP3"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
Option "Monitor-DFP2" "0-DFP2"
Option "Monitor-DFP4" "0-DFP4"
Option "Monitor-DFP3" "0-DFP3"
BusID "PCI:2:0:0"
EndSection
Section "Device"
Identifier "amdcccle-Device[2]-1"
Driver "fglrx"
Option "Monitor-DFP4" "0-DFP4"
BusID "PCI:2:0:0"
Screen 1
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Virtual 5760 1920
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "amdcccle-Screen[2]-1"
Device "amdcccle-Device[2]-1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
一切都运行良好，但动画（窗口最大化/最小化/关闭等）非常慢，以至于使 UI 难以使用。我应该调整哪些设置来解决这个问题？
谢谢！