The fact that one needs to log out and log back in turns me away from eGPUs as docking stations. If I ever have the time, I'd like to explore an offscreen rend

The fact that one needs to log out and log back in turns me away from eGPUs as docking stations. If I ever have the time, I'd like to explore an offscreen rendering solution (Xvfb?), though obviously there's going to be a significant performance penalty to forward that to the actual X server rendering the output. Ideally, full screen apps would be able to simply use the external GPU without much fuss directly. I am sure I am totally misinformed about what's doable, but I'd like to learn what direction I can expect Linux support to develop to allow seamless transition of apps from GPU to GPU.