The Unreal Editor menus are very slow,it looks like the menus are lagging, it takes around 3-6 sec to move from one menu to another.
The FPS from 120 goes down to 20-0 FPS and freezes if I am moving the mouse continuously and a bit quickly around the menus.
(I am using Plasma with a high end pc, Nvidia 1080Ti and AMD Threadripper 1950x)
I tested also Unity Engine and is working fine a bit of lag there as well but is unnoticed.
With another DE (tested MATE) is working fine no delays and not lag at all.
I have posted this problem to unreal engine and KDE forums but I guess this maybe has to do with Nvidia Drivers?