Annuus

Name: Annuus
Author: cao-awa

by cao-awa

Annuus targets network traffic in Minecraft 1.21.x servers, aiming to keep large servers responsive for many players.

FabricNeoForgeClient and serverGNU General Public License v3.0 onlyOpen source1.21 – 1.21.11

What it does

Annuus changes how game packets are sent between server and client, with the stated goal of improving network performance on large servers. The author notes that players do not need to install it to join, since client packets are still sent the way vanilla sends them. Chunk delta updates are one area the author describes as reducing the time spent collecting changed blocks, with a test sample of 1229 blocks.

The mod requires Daisy and runs on both the server and the client. Files are published for Fabric and NeoForge across 12 release versions, 1.21 – 1.21.11, and the code is released under the GNU General Public License v3.0 only.

Key features

Network packet handling
Annuus alters how network packets are produced and sent, which the author presents as a way to improve performance.
Chunk delta updates
Chunk delta updates are sped up, and the author reports a test where collecting 1229 blocks took less time.
View distance testing
The author lists test results at view distances 10, 12, 16 and 32 chunks, measured on a server with Annuus installed.

Compatibility

Latest build for each game version and loader.

Version

1.21.x12 of 12 versions with builds

1.21.111.0.171.0.17

1.21.101.0.16-fix21.0.16-fix2

1.21.91.0.16-fix21.0.16-fix2

1.21.81.0.16-fix21.0.16-fix2

1.21.71.0.16-fix21.0.16-fix2

1.21.61.0.16-fix21.0.16-fix2

1.21.51.0.16-fix21.0.16-fix2

1.21.41.0.16-fix21.0.16-fix2

1.21.31.0.16-fix21.0.16-fix2

1.21.21.0.16-fix21.0.16-fix2

1.21.11.0.16-fix21.0.16-fix2

1.211.0.16-fix21.0.16

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

DaisyUseful library, used in cao-awa's mods.

Required

Questions

Does Annuus need Daisy?

Yes. Daisy is a required dependency and must be installed alongside Annuus.

Do players need Annuus installed to join a server?

No. The author notes that a player does not need to install Annuus to connect, since client network packets are sent as they are in vanilla.

In the catalog

Annuus 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 mods3,545 Fabric mods Mods for 1.21.1119,862

More from cao-awa

Similar mods

Sodium1.16.3 – 26.3

Iris Shaders1.16.5 – 26.3

Entity Cullingb1.7.3 – 26.3

FerriteCore1.16.5 – 26.3

ImmediatelyFast1.18.2 – 26.3

Sodium Extra1.16.2 – 26.3

What the author says

Annuus is a mod for minecraft networking, improves network performance and makes the game more available for running on large server. Supported minecraft 1.21.x with fabric loader and neoforge loader, needs fabric-api when using fabric.

cao-awa, on the Modrinth page

Official listing

Modrinth page: modrinth.com/mod/annuus
Owner: cao-awa
Published: 2025-01-20
Updated on Modrinth: 2025-12-10
Facts verified: 2026-10-15