What's the difference between OpenGL advanced and normal modes?

I get that Basic mode uses the cpu and Normal uses the gpu, but what exactly does Advanced mode do?
The description says that it uses as much of the GPU as Normal Mode does, but adds "advanced techniques to improve drawing performance."
Has anyone seen one of these advanced techniques  in action or know of a list of these mysterious improved capabilities?

What CC said... Imagine a shader having say a length of 32 discrete instructions/steps vs. one with 16... The 32 one will concatenate specific operations in one step and may thus be more optimized, but will not work on a card that does not provide those 32 shader cores, since it could not be executed in one clock cycle. Then you would use the 16 one with instructions being split across 2 cycles... That's all there is to it and for al lintents and purposes mostly irrelevant and unimportant to the user...

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