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To pre-generate a Minecraft world with Chunky, install Chunky from the Plugins (or Mods) page, restart, then run chunky world world, chunky center 0 0, chunky radius 5000 and chunky start in the console. Chunky generates every chunk in that area in advance, so players exploring later don’t cause lag. Add a world border of the same size so players stay inside.

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Why pre-generate your world?

Generating new terrain is one of the heaviest jobs a Minecraft server does. When players fly or run into new land, the server must create chunks on the spot, and TPS drops for everyone. Pre-generating moves that work to a time you choose. It also makes web maps such as BlueMap and Dynmap render a finished world.

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How to install Chunky

1

Install

On a Paper server click Plugins; on Fabric, Forge or NeoForge click Mods. Search for Chunky and click Install. See install plugins.
2

Restart

Restart the server so Chunky loads.

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How to pre-generate with Chunky

Type these in the Console without / (in game, add /).
1

Pick the world

world is the default world folder. Use your world’s name if it’s different (see level-name in Server Properties or the Worlds page).
2

Set the centre

Use your spawn’s X and Z if spawn is not at 0 0.
3

Set the radius

The radius is in blocks from the centre.
4

Start

Progress shows in the console. Run chunky progress to check it.
5

Add a world border

The world border size is the diameter, so it’s twice the Chunky radius. Players can’t go past it, so the world never grows beyond what you generated.

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Chunky commands

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How big should the radius be?

Disk use grows with the area: a 10,000-block radius can use 10–25 GB. Start with 5,000 and check your disk on the Overview page. For the Nether, about 2,000 is enough. On Paper the Nether is called world_nether:
Run Chunky when few players are online. If players join while it runs, use chunky pause and chunky continue later. Progress is saved, so a restart doesn’t lose it.

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How to pre-generate safely on a live server

  • Make a backup first. Pre-generation writes many new files.
  • Check free disk space on the Overview page before a large radius.
  • Pause when players complain. chunky pause stops at once and keeps progress.
  • Schedule a restart afterwards to free memory. See schedules.
  • Generate each dimension separately. Finish the Overworld, then the Nether, then the End if you need it.

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Frequently asked questions

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How long does Chunky take?

It depends on the radius, the server type and mods. A 5,000-block radius can take several hours. Watch chunky progress for an estimate.

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Does Chunky work on Fabric and NeoForge?

Yes. Chunky has versions for mod loaders. Install it from the Mods page.

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Will pre-generating fix all lag?

It fixes lag from exploring. Lag from farms, entities or heavy plugins needs other fixes. See the lag checklist.

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Can I uninstall Chunky afterwards?

Yes. The generated chunks are part of your world and stay. Remove Chunky on Plugins or Mods > Installed and restart.

Minecraft server guide

Every Minecraft guide in one place.

Fix server lag

The full lag checklist.

spark profiler

Find other causes of lag.

Dynmap vs BlueMap

Render your pre-generated world.
Checked against the official Chunky documentation on 29 October 2026, and the plugin install tested on our Game Panel (Minecraft 26.1, Paper and Fabric). Steps may differ slightly if Chunky changes.

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Need Extra Help?

If you encounter any issues, our support team is ready to assist:

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Last Updated: October 2026