Switch to Wayland, your issue is that Xorg is not tear free by default and Ubuntu has chosen to stick with this legacy stack in 18.04: https://www.omgubuntu.co.

Switch to Wayland, your issue is that Xorg is not tear free by default and Ubuntu has chosen to stick with this legacy stack in 18.04: https://www.omgubuntu.co.uk/2018/01/xorg-will-default-display-server-ubuntu-18-04-lts https://www.omgubuntu.co.uk/2018/01/xorg-will-default-displa...