[Kubuxu]

Prime and Bumblebee are totally different from Nvidia Optimus. They have to render to render to Nvidia's GFX framebuffer and then copy it to Intel's GFX display framebuffer.

This is much more expensive than hardware implementation of Nvidia Optimus.

[dogma1138]

No they aren't, PRIME and BB only now support synchronisation which is how it also works on Windows.

It's more expensive on Linux because the DRM on Linux is broken, there is no longer "Optimus" since NVIDIA no longer uses a dedicated chip, you share a frame buffer with the IGP.

PRIME also supports the older Optimus chip laptops, but again this doesn't work that well, but then again these don't work well with Windows 10 either due to the changes to WDDM.