Chunky Extension
by Codx
Chunky Extension lets a server pause a Chunky pregeneration run while players are online and resume it once the server is empty again, with a time scheduler on top.
What it does
Chunky Extension is a server-side companion to the Chunky pregenerator. It drives Chunky directly through Chunky's own pause and continue commands, so the run stays under Chunky's control. When the first player joins, pregeneration pauses, and when the last player leaves, it resumes, so heavy chunk generation happens only while nobody is around to notice lag. Required dependencies are CodxLib and Fabric API, and the mod is published for Fabric, Forge, NeoForge and Quilt, with the latest files targeting 26.1.2.
Schedules are set with rules for each day of the week and a configurable timezone. A rule can continue generation at 03:00 and pause it at 08:00 on Monday to Friday, and rules can be added or removed with hour and minute sliders and day toggles. Everything can also be managed in an in-game menu that syncs live with the server, or through the chunky-extend command tree, where console use is the preferred option. It runs on the server alone, so players need nothing extra to join.
Key features
Player-aware auto-pause
Pregeneration pauses when a player joins and resumes when the server becomes empty again.
Time-based scheduler
Per-day rules with a set timezone decide when generation runs, pauses and continues.
In-game control panel
A menu opens the control panel, showing the server's real state and letting admins change settings without typing commands.
Full command tree
The in-game menu exposes the same controls as the chunky-extend command tree, and a switch turns the automatic pause and resume behaviour on or off.
Gallery
Compatibility
Latest build for each game version and loader.
26.x3 of 3 versions with builds
1.21.x11 of 11 versions with builds
1.20.x5 of 5 versions with builds
1.19.x3 of 3 versions with builds
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
Who it’s for: Server owners who run the Chunky pregenerator and want its work to follow player activity or a fixed weekly schedule.
How it compares
Chunky Offline is a server-required mod with a client-optional side, under the MIT License and open source, for 1.21 – 26.3 on Fabric, Forge, NeoForge and Quilt. Chunky Autopause is server-side only, open source under the MIT License, and covers Forge and NeoForge for 1.20.1 – 1.21. Auto Chunky is server-side only for Fabric alone, for 1.21.1 – 1.21.11, and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Chunky Extension | Fabric, Forge, NeoForge and Quilt | 1.19.2 – 26.1.2 | Server-side only | 2026-06-13 |
| Chunky Offline | Fabric, Forge, NeoForge and Quilt | 1.21 – 26.3 | Server required, client optional | 2025-11-26 |
| Chunky Autopause | Forge and NeoForge | 1.20.1 – 1.21 | Server-side only | 2024-06-17 |
| Auto Chunky | Fabric | 1.21.1 – 1.21.11 | Server-side only | 2026-03-26 |
Questions
Does Chunky Extension need Chunky installed?
Which dependencies must be installed with Chunky Extension?
Do players need to install Chunky Extension?
Can the schedule use different hours on different days?
In the catalog
Chunky Extension is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 15,189 mods support Minecraft 26.1.2.
More from Codx
Similar mods
What the author says
Pregenerate your world without ever lagging your players. Chunky Extended is a lightweight, server-side companion for the popular Chunky pregenerator. It automatically pauses Chunky while players are online and continues it once the server is empty, so all that heavy chunk generation only happens when nobody is…
Official listing
- Modrinth page
- modrinth.com/mod/chunky-extension
- Owner
- Codx
- Published
- 2023-06-10
- Updated on Modrinth
- 2026-06-13
- Facts verified
- 2026-10-15