Sorry Sebastian, I don't use Unity or Gnome.

But I've analyzed what the mentioned system settings plugin did. It
wrote a new file $HOME/.kde/env/qt-graphicssystem.sh with a single line
"export QT_GRAPHICSSYSTEM=raster".

Maybe you can find an appropriate place to set that environment variable
under Unity/Gnome.

Oh, and I forgot to mention in my last comment that you can set the
graphicssystem in the command line of an application with the option
"-graphicssystem raster" (only ONE minus character), as well.

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https://bugs.launchpad.net/bugs/586027

Title:
  xserver causes extreme cpu-load unexpected [Lucid]

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