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[FORK] Twilight Forest Thread Safety Addon

by CoZooo

[FORK] Twilight Forest Thread Safety Addon is a Forge addon that makes Twilight Forest world generation thread-safe for 1.20.1.

ForgeClient and serverMIT LicenseOpen source1.20.1

What it does

This unofficial fork by ishlandmc is aimed at the thread-safety side of Twilight Forest generation. It is tested to work with C2ME and Connector C2ME on Forge 1.20.1, with the goal of making generation both safe and faster. The mod is client and server, so a server running it needs it alongside every player who joins. It is open source under the MIT License, and its only published build is 1.1.0 for 1.20.1, dated 2026-02-01.

Two alternatives cover different parts of the same setup. Twilight Forest Cave Fix is server-side only under the MIT License and is marked incompatible with this addon, so the two should not be installed together.

Key features

  1. Thread-safe generation

    Twilight Forest terrain and structure generation is adjusted so it can run safely across threads.

  2. C2ME support

    The addon is tested with C2ME and Connector C2ME, so it targets the parallel generation those mods provide.

  3. Fork of the original addon

    It is an unofficial fork by ishlandmc, with source code and an issue tracker available from the project.

Compatibility

Latest build for each game version and loader.

1.20.11.1.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Incompatible 1

Twilight Forest Cave FixFixes the bug that causes Twilight Forest's caves to cut off when beneath water
Incompatible

How it compares

Full comparison

Twilight Forest Cave Fix is server-side only and is also under the MIT License, but it is marked incompatible with this addon. Rack It Up: Twilight Forest is client and server under the MIT License and open source, for 1.20.1.

ModLoadersGame versionsEnvironmentUpdated
[FORK] Twilight Forest Thread Safety AddonForge1.20.1Client and server2026-02-01
Twilight Forest Cave FixForge1.20.1Server-side only2025-09-15
Rack It Up: Twilight ForestForge1.20.1Client and server2026-05-23

Questions

Does the addon need C2ME to work?

It is tested with C2ME and Connector C2ME on Forge 1.20.1, and that pairing is the setup it is built around.

More from CoZooo

All projects
DLC Manager1.20.1 – 1.21.1

What the author says

This mod is an unofficial fork of TwilightForest Thread Safety Addon made by ishlandmc. It makes C2MEF or C2ME + Connector (C2ME + Connector is not fully tested) working with Twilight Forest on Forge 1.20.1 by making Twilight Forest generation thread-safe and faster.
CoZooo, on the Modrinth page

Official listing

Owner
CoZooo
Published
2026-01-15
Updated on Modrinth
2026-02-01
Facts verified
2026-10-15
Open on ModrinthCompare