No X11 because 'KDE drops it' is a rather silly argument for not including it, especially given that X11 is likely to trump Wayland-based systems on this metric. I'm using X11 and will continue to do so until something better comes along. Thus far Wayland is not better, just different and in several ways less functional. Yes, I do use X11 network transparency, sometimes through X2go, other times directly.

Wayland is better if you have multiple monitors with high DPI and different fractional scaling settings. But yes, it is less functional than X11 in other ways.

Also still on X11 because of xorgxrdp and X11 forwarding.

It would be cool to see this test with a CRT connected to a VGA port (adapters make it slower) and a PS/2 input device.

Silly author didn't take time to measure on X11, instead 'KDE drops it' author could use older version of KDE or SonicDE fork (rebranded KDE and only X11 support). And while on X11 i'm intresting how XLibre would fare in this metric, because git master of this project feels very snappy.