On my notebook Toshiba U205 S5034 - with Intel VGA compatible
controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express
Integrated Graphics Controller (rev 03), I fix the performance issue by
a change into xorg.conf:
Section "Device"
Identifier "Configured Video Device"
# It turns off disabling pipa A by a driver after while.
# Its 100 % working workaround.
Option "ForceEnablePipeA" "true"
# restore COMPIZ performance
Option "AccelMethod" "UXA"
# Option "FramebufferCompression" "off"
EndSection
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MASTER: Poor graphics performance on Intel
https://bugs.launchpad.net/bugs/252094
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