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Slow video on debian sid

I don't know exactly when this started, but my debian notebook is slow
on changing screens and programs. I alt+tab to switch programs and the
screen takes a while to rebuild. I mean, its not like its obviously
broken or buggy, but its enough to annoy. I use kde, and noticed
non-kde programs do this more than kde programs. Switching back to
konqueror is ok, switching to iceweasel or icedove takes a moment.
Switching to openoffice does take a moment. Sometimes I release
alt+tab but the window menu list keeps showing in the screen, needs an
extra 'tab' to go away.
System is an updated debian sid, in an Acer 5570z, 1.73GHz Pentium
dual core T2080, 2GB mem. Video card is Intel950, xorg driver is
'intel'. 128MB video memory set in the bios. Its got the 3D accel
working ok, I can do googleearth and compiz, etc. But the real problem
is indeed switching programs. xorg.conf goes below.
Thanks for any input!

bruno@neutron:~$ cat /etc/X11/xorg.conf
# xorg.conf (xorg X Window System server configuration file)
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Files"

Section "Module"

        Load "glx"
        Load "dri"


Section "DRI"

        Mode 0666


Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "kbd"
        Option          "CoreKeyboard"
        Option          "XkbRules"      "xorg"
        Option          "XkbModel"      "abnt2"
        Option          "XkbLayout"     "br"
        Option          "XkbVariant"    "abnt2"

Section "InputDevice"
        Identifier      "Configured Mouse"
        Driver          "mouse"
        Option          "CorePointer"
        Option          "Device"                "/dev/input/mice"
        Option          "Protocol"              "ImPS/2"
        Option          "Emulate3Buttons"       "true"

Section "InputDevice"
        Identifier      "Synaptics Touchpad"
        Driver          "synaptics"
        Option          "SendCoreEvents"        "true"
        Option          "Device"                "/dev/psaux"
        Option          "Protocol"              "auto-dev"
        Option          "HorizScrollDelta"      "0"

Section "Device"
        Identifier      "intel950"
        Driver          "intel"
       BusID           "PCI:0:2:0"
       VideoRam        128000
        Option          "XAANoOffscreenPixmaps" "true"
        Option          "AllowGLXWithComposite" "true"

Section "Monitor"
        Identifier      "Monitor Generico"
        Option          "DPMS"
        HorizSync       28-84
        VertRefresh     43-60


#Section "Monitor"
#       Identifier      "Flatron"
#       Option          "DPMS"
#       HorizSync       30-83
#       VertRefresh     56-75

Section "Screen"
        Identifier      "Default Screen"
        Device          "intel950"
        Monitor         "Monitor Generico"
#       Monitor         "Flatron"
        DefaultDepth    24
        SubSection "Display"
#               Modes           "1680x1050"     "1280x960"

Section "ServerLayout"
        Identifier      "Default Layout"
        Screen          "Default Screen"
        InputDevice     "Generic Keyboard"
        InputDevice     "Configured Mouse"
        InputDevice     "Synaptics Touchpad"

Section "Extensions"
     Option "Composite" "Enable"

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