Today I did a quick test running Tears of the Kingdom in Kubuntu on my iGPU system, and it performs really well. All the stuttering is because of shader compiling. Other than that, the game is perfectly playable, and in many cases has higher FPS than the native hardware.
Of course if you add a dedicated GPU the results would be much better. In my next test I am going to throw in a cheap GPU to see how much of an improvement it could bring.
Music: Fractal of Light - Chris Haugen