The Optimus support on Linux is similar to how it's done on ms windows. (I dual boot for a flight sim)
Performance wise, it depends on the GPU.
The lowspec one I have is an Intel embedded one. The higher spec is an NVidia GT750.
Using glxgears:
Without (Intel): 60fps
With (NVidia): 90-95 fps
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Joost
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Sent from my Android device with K-9 Mail. Please excuse my brevity.