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This must be a software issue in Linux, I don't have anything close to these problems in Windows. Perfectly fluid with 2 external 2160p60 screens connected.

WSL2 is amazing btw.

Probably infamous radeon drivers. Thanks for the hope :D

My T14 running Ubuntu 20.04 with the mainline kernel is connected via USB-C to a 3840x1600 screen and there is no lag at all.

Got a bottom end T495s here that quite happily handles an external 4K screen with Ubuntu.