ModsFinder

Despawn Mobs Simulation Distance

by darkcows9

Despawn Mobs Simulation Distance changes when mobs are removed at simulation distances below 8, so unloaded chunks stop filling the mob cap.

FabricServer-side onlyCC0 1.0 UniversalOpen source1.21 – 1.21.11

What it does

Under a simulation distance below 8, mobs can despawn before their chunks unload. Without this, mobs in unloaded chunks would accumulate and fill the mob cap. Despawn still reaches 128 blocks from the player, so vertical reach and mob farms keep working as intended. Players see the despawn radius shaped like a capsule rather than a sphere.

Key features

  1. Despawn below simulation distance 8

    Mobs are allowed to despawn while the simulation distance is set under 8.

  2. Mob cap protection

    Mobs in unloaded chunks no longer accumulate and fill the mob cap.

  3. Intact vertical despawn range

    The 128-block vertical despawn range is kept, so mob farms still function.

Compatibility

Latest build for each game version and loader.

No stable releases
Every published file is a beta or alpha build.
1.21.x12 of 12 versions with builds
1.21.111.2.0
1.21.101.2.0
1.21.91.2.0
1.21.81.2.0
1.21.71.2.0
1.21.61.2.0
1.21.51.2.0
1.21.41.2.0
1.21.31.2.0
1.21.21.2.0
1.21.11.2.0
1.211.2.0
ReleaseBetaAlphaNot available

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

How it compares

Full comparison

Low Simulation Distance is a Fabric mod for 1.21.1 that runs client-side only and is open source under the MIT License. Despawn Mobs Simulation Distance runs server-side only instead, and is open source under CC0 1.0 Universal for 1.21 – 1.21.11.

ModLoadersGame versionsEnvironmentUpdated
Despawn Mobs Simulation DistanceFabric1.21 – 1.21.11Server-side only2026-03-23
Low Simulation DistanceFabric1.21.1Client-side only2025-12-23

Questions

Does the server need Despawn Mobs Simulation Distance?

Yes. The mod is server-side only, so players join without installing it while the server runs it.

In the catalog

Despawn Mobs Simulation Distance is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 19,862 mods support Minecraft 1.21.11.

Optimization mods3,545Fabric modsMods for 1.21.1119,862

More from darkcows9

All projects
Carpet Bot Restriction1.21 – 1.21.4

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What the author says

Allows mobs to despawn with simulation distances under 8. Mobs despawn when they are 128 blocks away from the player. However, with simulation distances below 8, the mobs are unloaded before they are further than the despawn range. This causes mobs to accumulate in unloaded chunks and fill up the mob cap
darkcows9, on the Modrinth page

Official listing

Owner
darkcows9
Published
2026-03-23
Updated on Modrinth
2026-03-23
Facts verified
2026-10-15

Tags

ManagementMobsOptimization
Open on ModrinthCompare