VGA compatible controller [0300]: Silicon Integrated Systems [SiS]
661/741/760 PCI/AGP or 662/761Gx PCIE VGA Display Adapter [1039:6330]
(prog-if 00 [VGA controller])

OpenGL renderer string: Software Rasterizer

I suspect these pieces of information point to the problem.  The Linux SiS 
driver has not received much maintenance for some time, let alone development.  
In fact the 3D portion was recently dropped entirely by upstream Mesa - see 
http://www.phoronix.com/scan.php?page=news_item&px=OTg0Mg  
The first release to go without these drivers will be Mesa 7.12 when released 
in January.  Furthermore, according to http://dri.freedesktop.org/wiki/SiS 
"There is no DRI driver for "[SiS] 661/741/760 PCI/AGP" chipset..."

"Software Rasterizer" indicates that your system is not using the SiS
graphics chip for hardware-accelerated OpenGL rendering (not surprising
given that there is no driver), but instead has fallen back to the
slower software-based (CPU) rendering.

In conclusion, unfortunately I doubt that there is much that can be done
about this.  The only slight hope is that future releases of Ubuntu (by
then you would probably need to use the lighter Xubuntu or Lubuntu on
that machine) will probably switch from using the classic softpipe
software rasterizer to the newer and faster LLVMpipe software
rasterizer.  This has already occurred on Fedora 15 if you want to give
that a try - I'm not sure if they have a version with a "light" desktop.

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