OpenGL and GPU acceleration
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Uniinstall OpenGL driver from your machine ;) Or remove the card (note, that on Linux + Mesa, it will still work).
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If you use Qt 4.8 the opengl support is very minimal. So you maybe get not so much changes. you can see it very good in some animations with physical effects.
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Qt 5.0 has a better opengl support and with the graphics scene its a quite god archtitecure for the future