ChunkMill

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 several up), and let ChunkMill grind through them at a pace that keeps your server smooth. Big runs even resume automatically after a restart. A map view of what's already been generated is planned for a future update.

Why ChunkMill

• Fast — generates chunks in tightly-batched bursts and keeps multiple chunks in flight at once, so it pushes hard when there's headroom.
• Efficient — generated chunks are released as it goes, so a huge run won't balloon memory; it only does the work that's actually needed.
• Manageable — everything is named, listed, and controllable: define tasks once, run/queue/pause/cancel them, and watch live progress from a clean in-game panel.
• Safe for players — optional auto-pause means pregeneration never competes with people who are actually playing.

Features

• Named tasks — define a job once (dimension, square/circle, center, radius) and reuse it: task add spawn overworld square 0 0 5000.
• Run on demand or queue — run <task> starts it now, or lines it up behind the current run.
• Time scheduler — fire tasks (or pause/resume/cancel) on HH:mm rules for any days (all, mon-fri, sat,sun, …), timezone-aware.
• Smart throttling — pick adaptive (auto-paces to hold a target ms/tick) or fixed (set chunks/tick); both cap how many chunks are generated at once.
• Player-aware — optionally auto-pause the whole run while players are online, and resume when the server empties.
• Restart-safe — an in-progress run saves its progress and continues where it left off after a restart or crash.
• In-game control panel — just /chunkmill opens a live, tabbed screen that doesn't pause your world, so you watch generation happen in real time:
  • Dashboard — progress bar with a live chunks/sec rate and ETA, plus pause/resume/cancel and the upcoming queue.
  • Tasks — run, delete, or edit any task in a dedicated form (name, dimension, shape, center, radius).
  • Schedule — build rules with hour/minute sliders and clickable day toggles (no typing); pick the task from a list that shows each one's details.
  • Settings — engine, throttle, auto-pause, scheduler, and timezone.
  • Multi-loader — one mod for Fabric, Forge, and NeoForge.

Quick start

/chunkmill enable
/chunkmill task add spawn overworld square 0 0 5000
/chunkmill run spawn
/chunkmill status

Want it to run itself overnight?

/chunkmill settings scheduler true
/chunkmill schedule add 01:00 run spawn mon-fri

Commands

• /chunkmill enable | disable | status
• /chunkmill task add <name> <dimension> <square|circle> <cx> <cz> <radius> · task remove|list|info
• /chunkmill run <task> | pause | resume | cancel
• /chunkmill queue list | clear
• /chunkmill settings throttle <adaptive|fixed> · mspt · chunkspertick · maxconcurrent · autopause · scheduler · timezone
• /chunkmill schedule add <HH:mm> <run|pause|resume|cancel> [task] [days] · list|remove|clear|next
• /chunkmill (no arguments) — open the in-game control panel; /chunkmill help for the text list

Requirements

• CodxLib — required companion library (listed under Dependencies; most launchers install it automatically). Make sure it's present, or the mod won't load.
• Works on Fabric, Forge, and NeoForge for Minecraft 26.1.2.