I updated Ubuntu to 19.04 and now when I drag windows to the edge of the screen my system freezes for 20 seconds or so. I'm using Kubuntu (KDE Plasma).
Nvidia proprietary drivers 418.56
Symptoms match those described here: https://forum.manjaro.org/t/kde-nvidia-stutter-when-window-tiling/82312
Switching the KDE Compositor from OpenGL to XRender fixes the issue but the performance is pretty bad so it's not an ideal solution.
Is there a good solution to this?