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| Performance Enhancements 
Set Pixel Zoom to 1.0
Disable Fragment operations (Chapter 10)
Disable T&L
Reduce the amount of data conversion to/from the framebuffer
Unsigned image formats may
be faster than unsigned
 Large pixel rectangle operations are generally faster
than several small operations
Reduce the amount of data to transfer (use GL_UNSIGNED_BYTE
if possible)
Pixel transfer operations (scale/bias, offset) do have a
performance cost - use only if necessary
 
 
 
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