DatapacksJava
World Pregen
World Pregen is a datapack that allows you to automatically pre-generates a map and prevents lag caused by generation while you are playing.
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
🗺️ World Pregen
World Pregen is a datapack that allows you to automatically pre-generates a map and prevents lag caused by generation while you are playing.
Commands to know
- ▶️
/function wp:[dimension]/[size]> Start pre-generation- Dimension name: overworld, the_end, the_nether
- Size options: 2k, 4k, 6k, 8k, 10k, 20k (2k → 1000/-1000)
- ⏸️
/function wp:pause> Pause pre-generatino
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.9, 1.21.10, 1.21.11
- 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 — see the MC Java Mods guides for the full walkthrough.
Verified by MCModsHub
- Downloads as World Pregen 26.2.0.zip
- Download size: 331 KB
- Download link checked 29 Aug 2026 — working
These come from our own check of the pack file, not from the source page.