Chunk Pregenerator
by XAVI333
Chunk Pregenerator generates a square area of chunks ahead of time, so players who explore later meet no lag from chunk generation.
What it does
The mod fills a square of chunks around a chosen center point before anyone travels there. The center is set by an x and a y coordinate, and the radius is counted in chunks, each 16 blocks long. Once the area is generated, exploring it no longer forces the server to build new terrain at the same moment, which is the usual source of stutter on busy worlds.
The trade-off is time: a larger radius means more chunks to generate and a longer wait before the pregeneration finishes. Server owners often run it before opening a world to players, or on servers where many people explore at the same time. Chunk Pregenerator is server required and client optional, so the server must run it, while players may leave it out.
Files are published for Fabric, Forge, NeoForge and Quilt, with the same 1.1-mod build covering 26.3 and its releases from 1.21.5 onward. Its license is Creative Commons Attribution Non Commercial No Derivatives 4.0, and the mod is not open source.
Key features
Square pregeneration area
Chunks are generated in a square centered on chosen x and y coordinates, set by a radius in chunks.
Generation before exploration
Terrain is built ahead of time, so exploring the generated area does not trigger chunk generation.
Radius controls the wait
A larger radius covers more chunks but takes longer to finish, so the radius is chosen with that cost in mind.
Server-side operation
The work runs on the server, and players can join without installing the mod.
Gallery
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x7 of 7 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners who run multiplayer worlds and want terrain ready before players go exploring. Single-player players can use it too, but the mod is set up for a server install.
How it compares
ChunkMill is server-side only, published for 26.1 – 26.1.2 under the same Creative Commons Attribution Non Commercial No Derivatives 4.0 license, and is not open source. Genesis - World Previewer & Pregenerator is a client and server mod for 1.20.1 – 1.21.1, under a custom license, with no open source release. Copper Chunk Loader is server required with client optional, covers 1.21.2 – 26.3 and uses the Creative Commons Attribution Non Commercial Share Alike 4.0 license. Chunk Pregenerator covers 1.21.5 – 26.3 and is server required with client optional.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Chunk Pregenerator | Fabric, Forge, NeoForge and Quilt | 1.21.5 – 26.3 | Server required, client optional | 2026-09-17 |
| ChunkMill | Fabric, Forge and NeoForge | 26.1 – 26.1.2 | Server-side only | 2026-06-16 |
| Genesis - World Previewer & Pregenerator | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-09-06 |
| Copper Chunk Loader | Fabric, Forge, NeoForge and Quilt | 1.21.2 – 26.3 | Server required, client optional | 2026-09-16 |
Questions
Does Chunk Pregenerator need to be installed on the client?
Which loaders does Chunk Pregenerator support?
Does a larger radius slow the server down?
In the catalog
Chunk Pregenerator is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.
More from XAVI333
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What the author says
No more lag while exploring!\ Load chunks beforehand so you can enjoy exploration. This DataPack allows you to pregen chunks before you go exploring, so you won't experience lag from generating chunks during exploration.
Official listing
- Modrinth page
- modrinth.com/mod/chunk-pregenerator
- Owner
- XAVI333
- Published
- 2025-07-18
- Updated on Modrinth
- 2026-09-17
- Facts verified
- 2026-10-15