ChunkMill
by Codx
ChunkMill is a server-side chunk pregenerator that fills a world ahead of players, with queued and scheduled runs.
What it does
Pregeneration tasks define a dimension, a shape (square or circle), a center and a radius, and can be reused. A task is added with a command such as adding a spawn task in the overworld with a square of radius 5000 around 0 0. Tasks can be run, queued, paused, cancelled, and their progress is watched live in a clean in-game panel.
Generation is handled by the mod's own engine, which produces chunks in tightly batched bursts and releases generated chunks so that large runs do not grow memory without limit. Smart throttling can adapt its pace to a target milliseconds per tick or hold a fixed chunks-per-tick rate, and an optional auto-pause stops pregeneration while players are online. Big runs can resume automatically after a restart.
The mod requires CodxLib and Fabric API and is published for Fabric, Forge and NeoForge in 26.1 – 26.1.2, with 26.1, 26.1.1 and 26.1.2 available. It runs on the server alone, so players need nothing extra to join. The code is released under a Creative Commons license that is not open source.
Key features
Batched generation engine
Chunks are generated in tightly batched bursts, and generated chunks are released so long runs keep memory stable.
Named reusable tasks
A pregeneration job is defined once with a dimension, shape, center and radius, then run or queued as needed.
Run queue and live progress
Runs start in order behind the current run, and progress is shown in an in-game panel that can be paused or cancelled.
Time-based scheduler
Tasks can be fired, paused, resumed or cancelled at set times, with days and timezone-aware rules.
Adaptive throttling
Throttling can pace generation to a target milliseconds per tick or to a fixed chunks-per-tick cap, and optional auto-pause keeps generation from competing with players.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
Use cases
Preparing a world before launch
A server owner can queue a large square or circle task so players later explore chunks that already exist.
Overnight generation
A scheduled run can start at a set time on chosen days, pausing or resuming on the owner's rules.
Who it’s for: Server owners who want to generate large areas of a world without slowing play. The mod is server-side, so single-player players and clients do not need it.
Questions
Does ChunkMill need CodxLib or Fabric API?
Do players need ChunkMill installed?
Can a pregeneration run survive a server restart?
In the catalog
ChunkMill is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 15,189 mods support Minecraft 26.1.2.
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What the author says
A fast, efficient, and easy-to-manage chunk pregenerator — generate your world on command or on a schedule, without lagging the players who are online. ChunkMill is a lightweight, server-side mod with its own high-throughput generation engine. Define reusable pregeneration tasks, run them whenever you like (or queue…
Official listing
- Modrinth page
- modrinth.com/mod/chunkmill
- Owner
- Codx
- Published
- 2026-06-12
- Updated on Modrinth
- 2026-06-16
- Facts verified
- 2026-10-15