Check your cables?

What’s your DNS setup? I noticed you didn’t list the speeds for when it’s slow. DNS issues can cause weird things to happen.

If you have a pro or enterprise or even better a server license then there isn’t a lot to complain about.

I work in a mostly Windows environment and I have a 50/50 mix at home. My Linux stuff runs in Hyper-V.

Everything is shared either by software or SMB. Some software is only on Linux. Some is just way easier on Linux. Most things are in docker though.

The market I work in, I need to know both so I play with both. If you’re just pirating and sharing the content then who cares what OS it is hosted on. Use what you got. There are always ways to make it work.

https://nginx.org/en/docs/http/load_balancing.html

This sounds like what you are after.