Fixing Multi-GPU performance, part 1
zamundaaa.github.io
Performance on “secondary” GPUs has historically been suboptimal on Linux, especially with external GPUs. Let’s take a look at why it’s slow, and how we’re finally fixing it.

From the blog post:

So I fired up Cyberpunk 2077 with the “low” graphics preset and it went from 27 fps with Mesa main to 50 fps with linux-dmabuf v6. That’s more than 80% better performance!

One of the big limitations mentioned is that this requires the game to be run using Wine Wayland, which requires a proton fork (like Proton-GE or Proton-Cachyos).

Also while this is about the Plasma/Kwin implementation, presumably other compositors will get the performance improvement too, once they implement support for the protocol.