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Concurrent Chunk Management Engine project artwork

CurseForge · Minecraft mod

Concurrent Chunk Management Engine

A Fabric mod designed to improve the chunk performance of Minecraft.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which Concurrent Chunk Management Engine release matches 26.2 Fabric?

Updated 2 days ago
alpha file 0.4.2-alpha.0.34 devbuild for 26.2
Game version 26.2
Loader Fabric

Concurrent Chunk Management Engine 0.4.2-alpha.0.34 devbuild for 26.2 targets 26.2 with Fabric. The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server. No extra mods listed for this file.

Where it goes

Is Concurrent Chunk Management Engine required on the client, server, or both?

The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.

Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release Fabric
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does Concurrent Chunk Management Engine 0.4.2-alpha.0.34 devbuild for 26.2 need?

0.4.2-alpha.0.34 devbuild for 26.2 on 26.2 Fabric. Every mod below is checked against that same setup.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add Concurrent Chunk Management Engine without breaking your instance.

Built for Concurrent Chunk Management Engine 0.4.2-alpha.0.34 devbuild for 26.2 on 26.2 Fabric. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use 0.4.2-alpha.0.34 devbuild for 26.2. It targets 26.2 with Fabric; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    This file does not list any required mods. Do not add a library just because a different file uses it.

  3. 03

    Put it on the correct side

    The project page does not say whether it belongs on the client. The project page does not say whether it belongs on the dedicated server.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside 0.4.2-alpha.0.34 devbuild for 26.2. It opens that exact file at the source.

About this project

What does Concurrent Chunk Management Engine add?

Concurrent Chunk Management Engine

A Fabric/NeoForge mod designed to improve the chunk performance of Minecraft.

Please enable "Show alpha files" to show all available versions

Looking for experimental hardware-accelerated world generation as well?

Benchmarks for 1.21.10 w/ Terralith (Nov 21, 2025)

2t-80t 1t-16t

So what is C2ME?

C^2M-Engine, or C2ME for short, is a Fabric/NeoForge mod designed to improve the performance of chunk generation, I/O, and loading. This is done by taking advantage of multiple CPU cores in parallel. For the best performance it is recommended to use C2ME with Lithium and ScalableLux.

What does C2ME stand for?

Concurrent chunk management engine, it's about making the game better threaded and more scalable in regard to world gen and chunk io performance.

Vanilla parity

C2ME does not sacrifice vanilla functionality or behavior, or alter the vanilla world generation in the name of raw speed by default. However, due to the non-determinism of vanilla world generation, worlds will vary significantly run-to-run even with the same seed. This is not a bug on our side.

While we carefully check that we do not modify any vanilla behavior, bugs are unavoidable after all. So, if you do encounter an issue where C2ME deviates from the intended vanilla behavior, don't hesitate to open an issue.

Mod and Datapack compatibility

World generation datapacks that can run on vanilla Minecraft are fully supported.
Custom world generators implemented in mods usually runs well, but may cause compatibility issues due to certain design assumption used by mod authors being broken for further speedups of world generation.
As a world generation mod author, if you find your mod broken, don't hesitate to look for help in our discord server (linked below). We are willing to help mod authors to embrace scalable world generation.

Undefined behavior sanitization

C2ME includes CheckedThreadLocalRandom for world random (included in UWRAD) plus a few others. These detections exist to prevent mods from screwing up Minecraft internals and causing undebuggable problems.
The detection should almost never produce false positives, and should be taken seriously and reported to corresponding mod authors instead.

Usage notice

Backup your worlds and practice good game modding skills.

Support status for Minecraft versions

Only the latest Minecraft release and the latest Minecraft snapshot are fully supported. Older Minecraft releases are in long-term support and will receive critical bug fixes. Older Minecraft snapshots are not supported.

Support

Our issue tracker: Fabric NeoForge
Our discord server: link

More information

Check out the README.md here: https://github.com/RelativityMC/C2ME-fabric

Footnotes

https://gist.github.com/ishland/6eb0dd0af4216ffffd340ea994dc5796

Previous benchmarks

Due to markdown limitation on CurseForge (not having spoilers), see our Modrinth page for previous benchmarks.

Please DO NOT look for support or post errors in the comment section. Use our issue tracker for help and feature requests.

Project description from CurseForge.

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Concurrent Chunk Management Engine by Minecraft version and loader

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Recent files

Concurrent Chunk Management Engine versions and loaders

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Looking for an older file? The official CurseForge project page is in Resources.