Comment # 7 on bug 1213153 from Rainer Kaluscha

I'm also experiencing high delays in VNC sessions on a headless server after
upgrading from Leap 15.4. to 15.5. It takes about a second until a key pressed
is echoed :-(

I'm using kernel 6.4.6 on that machine.

Downgrading to xorg-x11-Xvnc-1.10.1-150400.7.5.2.x86_64 (i.e. package from Leap
15.4) solved the issue for me ...