How and Why to Pre-generate Minecraft Server Chunks

Direct answer

Pre-generate only the area you plan to support. A larger radius can require much more disk space and time. For Chunky, a simple workflow is:

chunky radius 5000
chunky start

Run it before launch or during a low-impact maintenance window, monitor server load, and keep a world border aligned with your intended playable area.

Why pre-generation helps

When players enter unexplored terrain, the server must generate chunks while also processing normal gameplay. Pre-generation performs that work in advance. It does not make already-generated chunks free to load, but it removes the generation step for the prepared area.

Plan the radius

Do not pre-generate “as far as possible.” Disk usage and generation time grow rapidly as the covered area expands. Chunky's documentation recommends starting with a smaller radius when unsure and expanding later.

Chunky platform support

Chunky supports common server implementations including Paper/Spigot, Fabric, Forge, NeoForge, Sponge, and Folia builds. Use the build that matches your platform and follow the project's current installation instructions.

Operational tips

Back up the world before large generation/trim operations.
Temporarily pause map renderers if they multiply the workload.
Watch CPU, MSPT, disk, and free space while generating.
Do not run multiple heavy pregeneration jobs simply because the tool allows it; your hardware may become saturated.

References

These sources were checked while preparing this article. Performance behavior and configuration can change between Minecraft/server-software versions, so verify version-specific settings before applying them.

Was this article helpful?

Help us improve this article

Tell us what is missing, unclear, outdated, or incorrect. You can also suggest something we should add.