I’m on KDE Plasma with Nvidia and Wayland with the proprietary 530 drivers but really the experience (due to Nvidia’s own fault) doesn’t feel polished at all although it’s very smooth, but the fact of having to be constantly switching between Xorg and Wayland because one or another program doesn’t behave the way it should in Wayland (frameskipping, blank screen, tearing) and I was thinking if using the open source drivers could fix something or make it worse.
I remember testing the open source drivers some time ago and running the Terraria compilation for Linux was not working well at all, and that being a native Linux compilation, maybe the Proton version would have worked better.
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Without a doubt you will have a better experience with an AMD GPU in Plasma.
My desktop PC has a 1650S and a latest generation AMD 6/12 CPU, the experience in Plasma + Xorg is honestly bad, it seems that I am using a 1 core CPU in Windows 11 with 1GB of RAM (exaggerating, but I think you would understand) because when I resize a window it feels lagged and sticky, and when I do simple tasks like putting a window in the corner it takes like 2 seconds to do it, which it shouldn’t, while in Wayland this doesn’t happen, what has been said happens, some programs sometimes they run, other times they don’t.
Now, I have a humble Lenovo laptop with integrated UHD graphics, 12GB of RAM and a 2/4 CPU, both the Xorg and Wayland experiences are incredibly polished and you can’t even tell the difference, and that’s because both AMD and Intel are much more open when it comes to developing their drivers, among other things.