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OpenGL Fast OpenGL??

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I was just curious to know which GL commands are accelerated by modern graphics cards? And how to write effective GL code to make the best use of the 3D accelerator.
1. Should I use OpenGL's own Transform functions (i.e. glRotate etc..), or should i write my own, how much of a speed differnece would it make?
2. Should everything be compiled into display lists as far as possible? What about direct mode, is there a speed penalty?
3. Any other tips on getting GL code to go fast...

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