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A Fabric client mod for Minecraft 26.2 that gives chunk mesh building its own dedicated, tunable thread pool instead of sharing vanilla's background pool with world generation and other background work.
Vanilla builds chunk render meshes on a thread pool it shares with worldgen, structure searches,
and other misc background work (sized CPU cores − 1). That pool is constantly contended, which
shows up as chunk-loading stutter when flying or exploring new terrain quickly.
Multicore Magic redirects chunk mesh building to a separate, dedicated pool that nothing else touches, and exposes its thread count as a live, in-game, resizable setting.
Note
This does not — and cannot — make the entire game "multicore." Minecraft's core tick loop is intentionally single-threaded and can't be safely parallelized wholesale. This mod targets one specific, real bottleneck (chunk mesh building), the same way mods like Lithium or Starlight target specific subsystems.
- Installation — requirements and how to install
- Usage — commands and the Mod Menu config screen
- Building — building the mod from source
- Troubleshooting — tuning advice and known caveats