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How to improve graphics performance on X11
There are many factors that could be affecting the rendering of widgets under Qt.
A few things you can try in order of importance:-
1. Update your video/graphics driver to the latest. This usually involves downloading a binary installer from your graphics card vendor – e.g. Nvidia and installing this on your Linux box.
2. Run the application using the raster engine. This renders everything in software if you experiencing problems. You can use -graphicssystem raster to do this
3. Make sure your xrender libraries are up to date/installed.
4.See also the blogs series on Qt Graphics and Performance [labs.trolltech.com].
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