CobblemonChunkmenager
CobblemonChunkmenager limits how many wild Pokemon spawn in each loaded chunk, so Cobblemon worlds lag less on busy servers.
What it does
The Fabric and NeoForge mod runs on the server only, so players join without installing anything. It is built to work alongside Cobblemon on Minecraft 1.21.1. Each loaded chunk has a Pokemon budget, 16 by default, and spawns above that budget are blocked before the entities are created. Blocking creation at the start is the main way it cuts the total entity count.
The mod keeps track of each loaded chunk by sorting it into one of three levels: HOT for chunks with players or active battles, WARM for moderate activity, and COLD for empty or idle chunks. It scans 50 chunks every 5 seconds. Every 10 seconds it finds chunks that are over budget and handles the excess wild Pokemon, first moving them to nearby chunks with free space and despawning any that cannot be relocated. Pokemon in battle and owned Pokemon are never touched.
Vanilla AI pathfinding and movement goals are disabled for Pokemon in COLD chunks, and the heat level only updates when a chunk changes state, so the per-tick cost stays near zero. The mod is released under the MIT License and is not open source.
Key features
Spawn prevention
Cobblemon's spawn event is cancelled for chunks that already hold their full budget of wild Pokemon.
Chunk heat tracking
Each loaded chunk is classified as HOT, WARM or COLD from its players, battles and recent activity.
Migrate before despawn
Excess wild Pokemon are moved to nearby chunks with free space first, and removed only when no place is found.
AI throttling in cold chunks
Vanilla movement and pathfinding goals are turned off for Pokemon in idle chunks to save work.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners running Cobblemon on Minecraft 1.21.1 with Fabric or NeoForge, who want fewer entities in each chunk. Players only join the server and need nothing installed.
How it compares
Cobblemon Autobattle is a client-side only mod for Fabric and NeoForge on 1.21.1, released under the GNU Lesser General Public License v3.0 or later and open source, so it changes battles on the client and not chunk density. Let Me Despawn is server-side only and open source under the GNU Lesser General Public License v3.0 only, with files for Fabric, Forge, NeoForge and Quilt across 1.12.2 – 26.3, so it removes entities by its own rules across more loaders.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| CobblemonChunkmenager | Fabric and NeoForge | 1.21.1 | Server-side only | 2026-09-12 |
| Cobblemon Autobattle | Fabric and NeoForge | 1.21.1 | Client-side only | 2025-12-02 |
| Let Me Despawn | Fabric, Forge, NeoForge and Quilt | 1.12.2 – 26.3 | Server-side only | 2026-09-17 |
Questions
Does CobblemonChunkmenager need to be installed on the client?
Which loaders does CobblemonChunkmenager support?
Are owned or battling Pokemon removed by the budget?
In the catalog
CobblemonChunkmenager is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from MarcoErCarrozza
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What the author says
A server-side Fabric mod for Cobblemon 1.7+ on Minecraft 1.21.1 that manages per-chunk Pokemon entity density to reduce server lag. Spawn Prevention — Hooks into Cobblemon's spawn event and cancels Pokemon spawns in chunks that are already at the entity budget (default 16 per chunk). This is the main performance…
Official listing
- Modrinth page
- modrinth.com/mod/cobblemonchunkmenager
- Owner
- MarcoErCarrozza
- Published
- 2026-02-15
- Updated on Modrinth
- 2026-09-12
- Facts verified
- 2026-10-15