[ChopSticksPlz]

In case of Linux, the best results so far I had with X2Go using the virtual desktop mode.

More about it here: https://cepa.io/2018/08/05/building-an-ultimate-remote-linux...

For Win & Lin, NoMachine works reasonably okeyish if your link is fast enough to stream in high quality.

[anotherevan]

I use a RaspberryPi running X2Go as a proxy to access work machines from home. It'll talk RDP or VNC at the remote end to the target desktops, but then X2Go's protocol over the Internet back to me.

I don't know if you'd get the kind of throughput the OP is after, but it works well for my needs.