Thank you for your time & patience. I did use static IP but to no avail.
I think that the gigabit bandwidth is simply not enough as I was able to use 5 gigabit ethernet for uncompressed 1080p/60 fps. I did the same on an android smartphone which has a 10 gigabit usb c connected to a computer with usb 3.1 gen2.
I was wondering if it’s possible to use type c or usb 3.1 to link 2 computers in spacedesk?