[elinkser]

So I tried a few...

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From tablet:

droidVNC-NG

From kobo:

(rust vnc client)
# einkvnc4 192.168.43.12 5902 --password vncpasswd --contrast 2

%cpu 85-90 for youtube!
Much more than your 30.


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From laptop:

$ sudo adduser kobo

$ su kobo

* Edit: Also relogged in as user kobo

$ sudo ufw allow proto tcp from 192.168.43.5 to 192.168.43.12 port 5902

$ sudo apt install x11vnc

$ x11vnc -opts

$ x11vnc -storepasswd

$ x11vnc -zeroconf -rfbport 5902 -rfbauth .vnc/passwd -geometry 1400x960 &

From kobo:

# ping 192.168.43.12

(rust vnc client)
# einkvnc4 192.168.43.12 5902 --password vncpasswd --contrast 2

%cpu 10 for text editing.
%cpu 60 for youtube

*very low latency for text editing.
low lag for youtube but not clear like yours.

From kobo chroot:

(x11 vnc client)
# vncviewer -geometry 1400x960+20+60 192.168.43.12::5902 &

%cpu below 5 for text editing.
%cpu below 30 for small unmaximized youtube

*very low latency for text editing.
unviewable youtube in large window.

I can get better editing latency, but not the clarity of your video images.