Gamescope
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Gamescope creates a virtual desktop for your game. This can be beneficial if your game doesn't play nicely with your desktop, for example if it doesn't catch your mouse, or if it breaks when loosing focus.
You can use Gamescope for downsampling. For example, use gamescope -w 3840 -h 2160 -- as command prefix, to downscale from 4k. The same can be achieved in Lutris, by enabling Gamescope, and setting 3840x2160 as resolution.
Setup
Run sudo setcap 'CAP_SYS_NICE=eip' $(which gamescope) to get a smooth gaming experience.[1]