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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?

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Looks like it is caused by this bug: https://bugs.kde.org/show_bug.cgi?id=406180

I managed to fix it by running: kcmshell5 qtquicksettings and setting render loop to Basic mode.

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