OpenGL applications run very slow or not at all

This happens if hardware acceleration for OpenGL is disabled.

If you have Windows 98/Me:
to get hardware acceleration, you need to disable all secondary monitors. You can do this from display properties, or more convenient with UltraMon or PowerStrip. If you want to use your secondary monitor(s) while working with an OpenGL app on the primary, re-enable secondary monitors after the OpenGL app has started. You will not be able to move the OpenGL app to a secondary monitor, or start another hardware-accelerated OpenGL app, but you can use the secondary monitors for any standard 2D apps. You can use the shortcuts feature of UltraMon to implement this workaround.

If you have Windows 2000/XP or later:
everything described above for Windows 98/Me will also work on Windows 2000/XP and later. But depending on the display drivers of your video cards, you may not have to disable any monitors. Try upgrading to the latest drivers, newer cards from 3Dlabs, ATI, Matrox and Nvidia should have OpenGL support on multi-monitor systems, at least on the primary monitor.

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