ModsFinder

Async

by AxalotLDev

Async speeds up entity processing by spreading the work across several CPU cores and threads, which helps servers with many mobs and other entities.

FabricNeoForgeQuiltServer-side onlyGNU General Public License v3.0 or laterOpen source1.21 – 26.3

What it does

Entity updates run in parallel rather than on one thread. The mod is aimed at servers carrying a large number of entities, where it aims to keep tick times steady. Async is server-side only, so players join without installing anything, and the server needs Fabric API on Fabric and Quilt.

The mod is open source under the GNU General Public License v3.0 or later. Its code descends from earlier multithreading work on the same idea. Files cover 1.21 – 26.3 across 17 release versions, with snapshot builds published. Async also ships a config file for tuning its behavior, and it is incompatible with Moonrise and Open Parties and Claims.

Key features

  1. Parallel entity processing

    Entities are handled across multiple CPU cores and threads instead of a single thread.

  2. Steadier tick times

    The mod is intended to keep tick times stable when a world holds many entities.

  3. Async random ticks

    An experimental option processes random ticks asynchronously, marked as experimental in the mod's feature list.

  4. Config file options

    Behavior is adjusted through a config file that the server owner edits.

Compatibility

Latest build for each game version and loader.

No stable releases
Every published file is a beta or alpha build.
26.x5 of 5 versions with builds
26.30.2.5+alpha-26.30.2.5+alpha-26.30.2.5+alpha-26.3
26.20.2.5+alpha-26.20.2.5+alpha-26.20.2.5+alpha-26.2
26.1.20.2.5+alpha-26.1.20.2.5+alpha-26.1.20.2.5+alpha-26.1.2
26.1.10.2.5+alpha-26.1.20.2.5+alpha-26.1.20.2.5+alpha-26.1.2
26.10.2.5+alpha-26.1.20.2.5+alpha-26.1.20.2.5+alpha-26.1.2
1.21.x12 of 12 versions with builds
1.21.110.2.0+alpha-1.21.110.2.0+alpha-1.21.110.2.0+alpha-1.21.11
1.21.100.2.0+alpha-1.21.100.2.0+alpha-1.21.100.2.0+alpha-1.21.10
1.21.90.2.0+alpha-1.21.100.2.0+alpha-1.21.100.2.0+alpha-1.21.10
1.21.80.1.8+alpha.1-1.21.80.1.8+alpha.1-1.21.80.1.8+alpha.1-1.21.8
1.21.70.1.8+alpha.1-1.21.80.1.8+alpha.1-1.21.80.1.8+alpha.1-1.21.8
1.21.60.1.8+alpha.1-1.21.80.1.8+alpha.1-1.21.80.1.8+alpha.1-1.21.8
1.21.50.1.7+alpha.7-1.21.50.1.7+alpha.7-1.21.50.1.7+alpha.7-1.21.5
1.21.40.1.8+alpha.1-1.21.40.1.8+alpha.1-1.21.40.1.8+alpha.1-1.21.4
1.21.30.1.7+alpha.7-1.21.30.1.7+alpha.7-1.21.30.1.7+alpha.7-1.21.3
1.21.20.1.7+alpha.7-1.21.30.1.7+alpha.7-1.21.30.1.7+alpha.7-1.21.3
1.21.10.2.0+alpha-1.21.10.2.0+alpha-1.21.10.2.0+alpha-1.21.1
1.210.2.0+alpha-1.21.10.2.0+alpha-1.21.10.2.0+alpha-1.21.1
ReleaseBetaAlphaNot available

This mod also publishes snapshot builds. Snapshots are not shown in the matrix.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

Optional 2

Concurrent Chunk Management Engine (Fabric)A Fabric mod designed to improve the chunk performance of Minecraft.
Optional
LithiumNo-compromises game logic optimization mod, useful for both single-player games and multi-player servers.
Optional

Incompatible 2

Open Parties and ClaimsAdds the ability to claim chunks and make player parties, integrates with Xaero's Minimap and World Map
Incompatible
MoonriseOptimisation mod for the dedicated/integrated server.
Incompatible

How it compares

Full comparison

Sepals is server-side only, open source under the GNU General Public License v3.0 only, and published for 1.21 – 26.3 on Fabric and NeoForge. ScalableLux is open source under the GNU Lesser General Public License v3.0 only, with the client or server optional, on the same loaders and range.

ModLoadersGame versionsEnvironmentUpdated
AsyncFabric, NeoForge and Quilt1.21 – 26.3Server-side only2026-10-04
SepalsFabric and NeoForge1.21 – 26.3Server-side only2026-10-15
ScalableLuxFabric and NeoForge1.21 – 26.3Client or server, optional2026-09-16

Questions

Does Async need Fabric API?

Yes. Fabric API is a required dependency on Fabric and Quilt, so it must be installed next to Async there.

Does a player need Async installed?

No. Server owners install it, and players connect with no copy of their own.

Which mods conflict with Async?

Moonrise and Open Parties and Claims are listed as incompatible, so they should not be installed together with Async.

In the catalog

Async is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.

Optimization mods3,545Fabric modsMods for 26.38,071

More from AxalotLDev

All projects
CancelBreaks1.19.2 – 26.1.2Donations1.20 – 1.21.8

Similar mods

Sodium1.16.3 – 26.3Iris Shaders1.16.5 – 26.3Entity Cullingb1.7.3 – 26.3FerriteCore1.16.5 – 26.3ImmediatelyFast1.18.2 – 26.3Sodium Extra1.16.2 – 26.3

What the author says

Async improves entity performance by processing entities in parallel across multiple CPU cores and threads. Async is currently in alpha testing and is experimental. Its use may lead to incorrect entity behavior and crashes.
AxalotLDev, on the Modrinth page

Official listing

Owner
AxalotLDev
Published
2024-10-13
Updated on Modrinth
2026-10-04
Facts verified
2026-10-15

Tags

MobsOptimization
Open on ModrinthCompare