Multicore Magic
by Levi_Designs
Multicore Magic gives Minecraft's chunk mesh building a dedicated, tunable thread pool that no other background work shares, and it is a client-side only mod.
What it does
Chunk meshes are normally produced on a pool that world generation and other background jobs also draw from. Multicore Magic moves that mesh work onto its own pool, which nothing else touches, so it stops competing with worldgen and the rest for the same CPU cores. The pool is sized automatically from the number of CPU cores, with a default up to twice the core count, and its thread count can be changed in the config screen while the game runs, with the effect visible immediately.
The mod is scoped to one real bottleneck. The core tick loop of the game cannot be parallelized wholesale, so Multicore Magic does not make the whole game multicore, in the same way Lithium and Starlight target specific subsystems. Only the client needs it, and it can be used in single-player and on multiplayer clients. It is open source under the MIT License, and the code, issue tracker and wiki are public.
Installation requires Cloth Config API, Fabric API, Forgified Fabric API, Launchpad and Mod Menu. Multicore Magic is published for Fabric and NeoForge, with files for 26.1 – 26.2 and four release versions in total, 26.1, 26.1.1, 26.1.2 and 26.2. The latest Fabric file, 1.0.2, targets 26.2, and the latest NeoForge file, also 1.0.2, targets 26.1.2.
Key features
Dedicated chunk builder pool
Chunk mesh building runs on its own pool, separate from the vanilla shared background executor.
Live-resizable thread count
The thread count can be changed in the middle of a game, and the new value takes effect at once.
Mod Menu and Cloth Config screen
A settings screen with tooltips is reachable from Mod Menu and built with Cloth Config.
Status command
An in-game command reports the active and queued task counts for the chunk pool.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 5
Questions
Does Multicore Magic need Fabric API on NeoForge?
Why does the NeoForge build wait for a Launchpad update?
Does the mod work on a dedicated server?
In the catalog
Multicore Magic is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 13,894 mods support Minecraft 26.2.
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What the author says
Gives Minecraft's chunk mesh building its own dedicated, tunable thread pool — so chunk loading doesn't compete with world generation and other background tasks for CPU cores. Vanilla builds chunk render meshes on a thread pool it shares with world generation, structure searches, and other misc background work. The…
Official listing
- Modrinth page
- modrinth.com/mod/multicore-magic
- Owner
- Levi_Designs
- Published
- 2026-07-04
- Updated on Modrinth
- 2026-07-08
- Facts verified
- 2026-10-15