Interesting results, in a nutshell it seems like Wayland/Xwayland performance on both nVidia and AMD wins slightly more than it loses. Once VRR is live in nVidia 545 series driver, for 3D games, Wayland is looking to deliver a great experience. Performance when Wine’s Wayland code is ready to mainline will be very interesting given that Xwayland needs will be negated at that point.
I had the same problem with Steam today, It was fixed by downloading the deb from Steams website. I am not running Wayland so I don’t think this is a Wayland problem but could be wrong.