My laptop is a Dell Precision M4800 -- not the newest but is perfectly fast enough for what I need to do. I run KDE under X usually. Tried wayland for the first time recently and there was huge input lag with moving the mouse. I found it unusable. Other people have similar problems [1] [2]. For me at least wayland is a no go until the performance matches X.

[1] https://www.reddit.com/r/kde/comments/1335gj5/mouse_feels_la... [2] https://www.reddit.com/r/wayland/comments/wj7jji/mouse_lag_o...