Folia, PaperMC's multithreaded Minecraft server: how regionised threading works and when to use it.
Every entity, every block update, every redstone pulse — one thread, twenty times a second, 50 milliseconds a pass. Folia's answer is to stop sharing the kitchen. Here is the tick budget and the ownership rules, read from the PaperMC source.
There is a fifteen-year fork tree underneath every Minecraft server, and most admins copy a jar without knowing what's in it. Here's the whole chain, with the code — including the config key most DAB guides get wrong.
Every six months the same thread appears and nobody maps the JVM engineering onto what a Minecraft server actually does. This does — version by version, with the flag most guides still tell you to set that will eventually stop your server from booting.
