I seem to have the same issue on Xorg, even when I have an HDMI screen as well as a DP screen connected, but with the laptop lid closed. When I switch to Wayland it's much better but the input stalls frequently leading to input being repeated a number of times.
I'll wait until the patch comes out to see if it helps but I see latency on the same dock with the same devices connected on Wayland with the laptop display in use, so it may be that this is the most obvious issue currently but that there may be a lot of other issues to resolve at the moment.
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