Chunk Pregeneration

World pregeneration helps improve performance and reduce lag spikes by generating chunks before players explore them. This prevents real-time world generation from consuming CPU and I/O during gameplay.

This guide explains how to pregenerate your Minecraft worlds depending on whether you’re using Spigot/Paper (plugin-based) or Forge/Fabric (mod-based) servers.

Pregeneration tools are available only for Java-based servers such as:

  • Spigot

  • Paper

  • Purpur

  • Forge

  • Fabric

  • NeoForge

Bedrock servers are not compatible with pregeneration plugins or mods.

Plugin Method

Recommended Plugin: Chunky

Chunky – a fast, efficient world pregenerator that works across most Bukkit-compatible servers.

Installation via One-Click Plugin Installer

  1. Log into your Pterodactyl panel.

  2. Open your server and go to the “Plugins” tab.

  3. Search for Chunky.

  4. Click Install Plugin to add it automatically.

  5. Restart the server once installation completes.

How to Pregenerate with Chunky

After the plugin is installed:

  1. Join your server as an operator (OP) or via the console.

  2. Use the following commands:

/chunky radius 5000
/chunky start

  • radius defines how far from spawn chunks will be generated.

  • Example: 5000 blocks creates a 10,000×10,000 area.

  1. You can monitor progress with:

/chunky status

  1. To pause or cancel pregeneration:

/chunky pause
/chunky cancel

Disk Space Considerations

Radius
Approx. Size

2,500 blocks

~1 GB

5,000 blocks

~4 GB

10,000 blocks

~16 GB

Mod Method

If you are running a Forge, Fabric, or NeoForge server, use a mod instead of a plugin.

Recommended Mod: Chunky

Installation

  1. Visit Modrinth.

  2. Download the version compatible with your Minecraft and Forge/Fabric build.

  3. Upload the .jar file to your server’s /mods/ directory using the File Manager or SFTP.

  4. Restart your server.

Pregeneration Commands

Once in-game or using console:

/chunky radius 5000
/chunky start

Tips and Warnings

  • Always backup your world before pregeneration.

  • Pregeneration can cause high CPU and disk I/O, run it during low player activity.

  • Do not pregenerate dimensions you don’t need (e.g., Nether, End) unless necessary.

  • Stop pregeneration before shutting down to prevent corruption.

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