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I have installed the Lightworks video editor on Debian Jessie. For best performance it needs to run on a discrete video card with the proprietary driver. A Nvidia GTX 860M in my case. I have installed Bumblebee to switch between video cards as needed. With optirun or primusrun it is possible to run an application using the Nvidia card.

When I use optirun for Lightworks it crashes after startup. When I use primusrun it doesn't and performance is okay. Why is that? What is the difference between the two?

This question has been asked before, but remains unanswered.

This answer on a different question does allude to a difference, but doesn't explain it.

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Bumblebee, earlier was using VirtualGL as its core and now switched to Primus technology.

optirun uses VirtualGL and primusrun uses the Primus technology. That must be the reason.

Note: Though the question was posted long back, the answer would help those want to understand the difference.

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