Pregenerate the world

Why exploration can spike lag#

When a player enters new territory, the server must calculate terrain, structures, lighting and modded world generation while also running the live game. Pregeneration creates those chunks earlier during a planned maintenance window.

1. 1
   Decide a realistic world border. A radius twice as large covers roughly four times the area and storage.
2. 2
   Make and verify a backup.
3. 3
   Install a Fabric-compatible pregeneration tool only after confirming support for the exact Minecraft version. Chunky has Fabric builds for many releases, but check its current Modrinth project ↗ rather than assuming.
4. 4
   Start with a small test radius and read the project’s current commands.
5. 5
   Run when players are offline and watch CPU temperature, disk space and MSPT.
6. 6
   Let it finish or use the tool’s documented pause/stop command—do not kill the server.
7. 7
   Restart normally and test exploration near the generated edge.