FastChunk
A high-performance chunk pre-generator that uses less CPU/RAM than alternative options on the market.
Features
- Fully async loading — uses
getChunkAtAsync, never blocks the main thread - Adaptive TPS throttling — monitors server TPS in real time and automatically scales speed up or down
- Bounded concurrency — caps the number of chunks loading simultaneously to prevent RAM spikes
- Spiral ordering — reduces disk I/O by walking chunks in region-file order
- Auto-unload — frees RAM immediately after generation if no players are nearby
Commands
| Command | Description |
|---|---|
/fastchunk start <world> <radius> |
Start pre-generation |
/fastchunk pause [world] |
Pause temporarily |
/fastchunk resume [world] |
Resume |
/fastchunk stop <world> |
Stop and clear the task |
/fastchunk status |
View progress |
Permissions
fastchunk.use(default: op)
Supported Versions
1.19 – 1.20.x (see the Versions tab for each release)
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.19.4
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as FastChunk-1.0.0.jar — drop this file into the mods folder
- Download size: 12 KB
- Download link checked 24 Aug 2026 — working
These come from our own check of the pack file, not from the source page.