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Where's my Brain (WMB)

by Bobcat

Where's my Brain uses off-thread tracking and regional load measurement to lower the server work that entities create, across Fabric and Forge.

FabricForgeClient or server, optionalAll rights reserved1.20.1 – 1.21.8

What it does

The mod decides per player, off the main thread, which entities need to be tracked, and schedules work through per-dimension thread pools that back off when queues grow. Settings such as updateInterval, cacheDuration and maxTrackingDistance shape those decisions, and the scheduler is tuned by AutoTuner when load rises. Timeouts and fallbacks keep the main thread safe when a task runs late.

Regional TPS Manager, called R-TPS, splits each dimension into square regions, by default four chunks per side, and keeps measuring load in every region. Mob AI is throttled by distance, so entities far from players, and leashed, named, owned or tamed persistent entities, consume less CPU. High-importance entities such as bosses are exempted through default code and per-entity overrides. Every option is documented inline in the generated wmb.toml file.

Installation needs Architectury API. The mod is built on Architectury, so it loads on Fabric and on Forge, and it works on either side, and neither side needs it. Files cover 15 release versions, 1.20.1 – 1.21.8, and the code is licensed as All rights reserved, so it is not open source.

Key features

  1. Async entity tracking

    Per-player visibility and tracking decisions run off the main thread to reduce main-thread work.

  2. Adaptive thread pools

    Global per-dimension thread pools use queue-aware scheduling and backpressure that adjusts under load.

  3. Regional TPS measurement

    R-TPS splits dimensions into regions and tracks the load of each one, so lag can be traced to an area.

  4. Distance-aware mob AI

    Distant idle mobs are throttled to cut wasted CPU, while nearby gameplay keeps its normal feel.

  5. Per-entity overrides

    Bosses and other important entities are exempted by default, and server owners can set overrides per entity.

Compatibility

Latest build for each game version and loader.

1.21.x9 of 9 versions with builds
1.21.8Not available1.2-SNAPSHOT
1.21.7Not available1.2-SNAPSHOT
1.21.6Not available1.2-SNAPSHOT
1.21.5Not available1.2-SNAPSHOT
1.21.4Not available1.2-SNAPSHOT
1.21.3Not available1.2-SNAPSHOT
1.21.2Not available1.2-SNAPSHOT
1.21.1Not available1.2-SNAPSHOT
1.21Not available1.2-SNAPSHOT
1.20.x6 of 6 versions with builds
1.20.61.2-SNAPSHOT1.2-SNAPSHOT
1.20.51.2-SNAPSHOT1.2-SNAPSHOT
1.20.41.2-SNAPSHOT1.2-SNAPSHOT
1.20.31.2-SNAPSHOT1.2-SNAPSHOT
1.20.21.2-SNAPSHOT1.2-SNAPSHOT
1.20.11.2-SNAPSHOT1.2-SNAPSHOT
ReleaseBetaAlphaNot available

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

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Architectury APIAn intermediary api aimed to ease developing multiplatform mods.
Required

Questions

Does Where's my Brain need Architectury API?

Yes. Architectury API is the required dependency, and the mod is built on Architectury to load on both Fabric and Forge.

Does the server need the mod?

Either side can run it, and neither needs it, so a server can run it while clients join with or without it.

Which game versions does it support?

Release files cover 1.20.1 – 1.21.8, and no snapshot builds are published for this mod.

Where are the settings?

Settings are described inline in the generated wmb.toml file, so each option can be read where it is set.

In the catalog

Where's my Brain (WMB) is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 17,695 mods support Minecraft 1.21.8.

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What the author says

A lightweight, loader-agnostic Minecraft 1.20.1 optimization mod focused on smarter mob AI scheduling, distance-aware throttling, and adaptive auto-tuning. Keep gameplay feel near players while cutting wasted CPU on far-away or idle mobs. Works on both Forge and Fabric via Architectury. Config location by loader: …
Bobcat, on the Modrinth page

Official listing

Owner
Bobcat
Published
2025-09-04
Updated on Modrinth
2025-09-05
Facts verified
2026-10-15

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