Ask HN: Best way to screen share from mac to mac on local network?

I have a Plex server running on an old Macbook Air that I remote into currently with OSX's built in screen sharing. I only ever remote in from my local network, which is definitely not slow and is on a good router.

The Air is fine when connected directly to a monitor, but remoting in with screen sharing is just god awful, feels like a frame or two a second.

I leave the Air hooked up to my TV but ultimately its lid is shut all the time and I only ever remote in.

Is there a better way to screen share from one mac to another that isn't slow as shit?