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.
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
Async entity tracking
Per-player visibility and tracking decisions run off the main thread to reduce main-thread work.
Adaptive thread pools
Global per-dimension thread pools use queue-aware scheduling and backpressure that adjusts under load.
Regional TPS measurement
R-TPS splits dimensions into regions and tracks the load of each one, so lag can be traced to an area.
Distance-aware mob AI
Distant idle mobs are throttled to cut wasted CPU, while nearby gameplay keeps its normal feel.
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
1.20.x6 of 6 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Questions
Does Where's my Brain need Architectury API?
Does the server need the mod?
Which game versions does it support?
Where are the settings?
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.
More from Bobcat
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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: …
Official listing
- Modrinth page
- modrinth.com/mod/wheres-my-brain
- Owner
- Bobcat
- Published
- 2025-09-04
- Updated on Modrinth
- 2025-09-05
- Facts verified
- 2026-10-15
