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Donux ditherig is open source lol just read the code yourself, all it does is change intel graphics registers and it's been a staple in this community for years as it can noticeably improve screen output
NoMachine uses their own "NX protocol", way faster than VNC and works fast for me over wi-fi, so I don't need ethernet. I've also used it remotely a couple times before and it also works pretty well. It also automatically reconnects after sleep mode so you can just leave it open and it rarely ever disconnects.
(And if you're ever doing anything that doesn't rely on the power or the apps of the Mac, you can always use Windows locally when needed, despite being an old laptop it's still fast enough for writing documents and most web browsing.)
NoMachine even supports optionally enabling shared USB devices and printers over the connection, no idea how fast, but the fact it even offers it is great.
In the end for me eye comfort matters and not flawless performance, since my day to day work is mostly just reading and writing documents, emails, and code it's more than fast enough for that to be very usable for me. Even panning around files like photos and designs runs at a pretty good frame rate and doesn't have much input lag.
If the setup is making it actually possible to work since it's easy to look at the screen, that's better than any faster setup where I can't even comfortably use the screen or concentrate on my work anyway