I just updated my system via dnf update, and after a reboot, my external screen was extremly laggy (like 1 second lag). After some debugging, trying the binary nvidia driver (couldn’t get the display to work after all), I investigated what dnf updated. Executed dnf history, searched for the update command, and executed dnf history info 57 (where 57 is the transaction id).

It showed an update of the X server, which I suspected caused the lag. I listed the old versions with dnf --showduplicates list xorg-x11-server-Xorg and dnf --showduplicates list xorg-x11-server-common and downgraded them to the second last version with dnf install xorg-x11-server-Xorg-1.20.5-7.fc31.x86_64 xorg-x11-server-common-1.20.5-7.fc31.x86_64.

After a reboot, the lag is gone. Maybe this helps someone. I just hate the Linux graphics subsystem :(

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