I have a Dell Poweredge T430 with “Intel(R) Xeon(R) CPU E3-1240L v5 @ 2.10GHz”, 32GB RAM, and 16TB RAIDZ ZFS. It runs FreeBSD.
It’s not stressed at all by hosting DD. I’ve hosted several Minecraft servers at once and Factorio. This is not just for DD.
Generally the key is how many loaded chunks is the server keeping loaded. I minimize chunk loaders. I also pregenerate the map out to the world boundary. The most consistent cause of server lag is chunk generation.