I used to find it quickly boring back in the days i hosted a server, but nowadays it suddenly became sustainably interesting.
The addition of planets really changed the dynamics of the game, and made it possible to have a variety of permutations of fun and things to do, especially with a few mods to add some actual enemies.
i7-8700K, 32Gb RAM, 1070 Ti, never had it lag despite some rather large scale shenanigans.
Reading through the old thread, looks like they done a lot of a good job - collision detection works great, there is a garbage collection system now (the biggest piece of maintenance work on a server), planet rendering makes me want to look under the hood.
In other words, it's really stable and immersive now.