No, xserver-xgl is not installed.
Did you edit your xorg.conf? Since changes in my xorg.conf did not increase performance, mine is almost empty (default after Ubuntu installation):
... Section "Device" Identifier "Configured Video Device" EndSection
Section "Monitor" Identifier "Configured Monitor" EndSection
Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" EndSection ...
No, xserver-xgl is not installed.
Did you edit your xorg.conf? Since changes in my xorg.conf did not increase performance, mine is almost empty (default after Ubuntu installation):
...
Section "Device"
Identifier "Configured Video Device"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
EndSection
...