[xdanger]

Just to let people know how to get the latency down with uxplay:

    Upgrade the debian to bookworm (uxplay is in the repos for that one)
    apt install uxplay
    
    in in /boot/config.txt
    change doverlay to:
    dtoverlay=vc4-kms-v3d
    force hdmi: (i had some problems with kms)
    hdmi_force_hotplug=1
    add gpu mem:
    gpu_mem=256

    then run: (-a disables audio)
    uxplay -vs kmssink -a

and now you have and airplay monitor that can mirror or extend your desktop.