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Eliminating The #1 Cause of Lag

When a player explores new land, the Minecraft engine must calculate biomes, ore deposits, and structures in real-time. This is extremely CPU-intensive. By “Pre-Generating” your world, you calculate these once and store them on disk, turning heavy math into a simple file read.
Reading TimeDifficultyLast Updated
10 minutesIntermediateJanuary 2026

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Installation & Setup

  1. Download: Get the latest Chunky JAR from Hangar.
  2. Upload: Place it into your /plugins/ folder and restart your server.
  3. The Target: Determine your world size.
    • A 5,000-block radius (10k x 10k total) is sufficient for most medium communities.
    • Note: Area increases exponentially. A 10k radius is 4x larger than a 5k radius.

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Core Commands

Open your console and run these in sequence:
  1. chunky radius 5000: Sets the generation boundary.
  2. chunky center 0 0: Centers the render on spawn.
  3. chunky start: Begins the generation process.

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Critical Metrics

  • Performance: While Chunky is running, it will use 100% of your CPU. Everything else on the server will lag.
  • Timing:
    • 5k Radius: 1-3 hours.
    • 10k Radius: 8-15 hours.
  • Disk Space: A 10k radius map will use approximately 10GB - 25GB of disk space depending on version and world complexity.

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Don’t Forget the Nether

Players will often explore the Nether for fast travel. We strongly recommend pre-generating a 2,000-block radius in the Nether as well: /chunky world world_nether followed by the radius and start commands.

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Support Channels

If you need assistance or have any questions, please contact our support team:

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First Month Discount

Use code KB20 at checkout to get 20% off your first month of hosting!
Last Updated: January 2026 | Minecraft: Map generation complete.