ModsFinder

NumFlux

by Mr.Toad

With NumFlux installed on a server, several entity and item calculations run through simpler math, which lightens the load on busy worlds.

FabricNeoForgeQuiltServer-side onlyMIT License1.20.5 – 26.3

What it does

NumFlux is a small server-only optimization mod for Fabric, NeoForge and Quilt. It speeds up certain interactions between entities and simplifies some mathematical formulas the game evaluates each tick. Its changes are aimed at servers that are heavily loaded with dropped items, arrows, ground mobs and similar entities within a large radius.

The author lists a typical performance gain of about 2–4%, with more reported in the most crowded cases. Other changes cover arrow particles, the fix for burning arrows, a rework of the mob despawn mechanism and minor improvements that use zero-GC caches. A separate set of client-side optimizations is handled by GPUBooster, a fork created to keep server functions apart from the original code.

Architectury API is required on every loader, so it must be installed alongside NumFlux. The mod is released under the MIT License and is not open source. Files exist for 1.20.5 – 26.3, with the latest builds for 26.3 on Fabric and NeoForge and 26.1.2 on Quilt.

Key features

  1. Faster formula evaluation

    Certain mathematical formulas used during entity and item updates are replaced with simpler calculations.

  2. Arrow particle and fire fixes

    Arrow particle handling is adjusted, and burning arrows are corrected so they behave as intended.

  3. Reworked mob despawn

    The despawn mechanism for mobs is improved to reduce the work done on crowded server areas.

  4. Zero-GC caches

    Minor improvements use caches built to avoid garbage collection overhead during frequent operations.

Compatibility

Latest build for each game version and loader.

26.x4 of 4 versions with builds
26.31.0.6-26.3-fabric1.0.6-26.3-neoNot available
26.1.21.0.5-26.1-26.1.2-fabric1.0.5-26.1-26.1.2-neo1.0.5-26.1-26.1.2-fabric
26.1.11.0.5-26.1-26.1.2-fabric1.0.5-26.1-26.1.2-neo1.0.5-26.1-26.1.2-fabric
26.11.0.5-26.1-26.1.2-fabric1.0.5-26.1-26.1.2-neo1.0.5-26.1-26.1.2-fabric
1.21.x9 of 9 versions with builds
1.21.81.0.1-1.20.5-1.21.8-fabric1.0.1-1.20.5-1.21.81.0.1-1.20.5-1.21.8-fabric
1.21.71.0.1-1.20.5-1.21.8-fabric1.0.1-1.20.5-1.21.81.0.1-1.20.5-1.21.8-fabric
1.21.61.0.1-1.20.5-1.21.8-fabric1.0.1-1.20.5-1.21.81.0.1-1.20.5-1.21.8-fabric
1.21.51.0.1-1.20.5-1.21.8-fabric1.0.1-1.20.5-1.21.81.0.1-1.20.5-1.21.8-fabric
1.21.41.0.1-1.20.5-1.21.8-fabric1.0.1-1.20.5-1.21.81.0.1-1.20.5-1.21.8-fabric
1.21.31.0.1-1.20.5-1.21.8-fabric1.0.1-1.20.5-1.21.81.0.1-1.20.5-1.21.8-fabric
1.21.21.0.1-1.20.5-1.21.8-fabric1.0.1-1.20.5-1.21.81.0.1-1.20.5-1.21.8-fabric
1.21.11.0.4.1-1.21.1-fabric1.0.4.1-1.21.1-neo1.0.4.1-1.21.1-fabric
1.211.0.2-1.21-1.21.1-fabric1.0.2-1.21-1.21.1-neo1.0.2-1.21-1.21.1-fabric
1.20.x2 of 2 versions with builds
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

Architectury APIAn intermediary api aimed to ease developing multiplatform mods.
Required

Use cases

Busy survival servers

Servers with many dropped items, arrows and mobs in a large radius are where the entity-related changes apply most.

Mob-heavy worlds

Worlds with large mob populations benefit from the despawn rework and the cheaper entity calculations.

Who it’s for: Server owners who run survival or multiplayer worlds with heavy entity counts. Players who only join a server gain nothing, since the mod needs no client install.

Questions

Does NumFlux need to be installed on the client?

No. Players join without it, since only the server has to run the mod. Only the server runs NumFlux.

Which dependency does NumFlux require?

Architectury API is required. It must be installed on the server next to NumFlux on every supported loader.

Does NumFlux work with the client optimizations of GPUBooster?

GPUBooster is a separate fork that handles client-side optimizations. NumFlux itself only changes server-side behavior.

Which game versions does NumFlux support?

Files exist for 1.20.5 – 26.3, including 1.21.8, 26.1 and 26.3. The most recent build for Quilt targets 26.1.2.

In the catalog

NumFlux 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 Mr.Toad

All projects
GPUBooster1.12.2 – 26.2ToadLib1.19.3 – 26.3Palladium1.19.4 – 1.21.8EnlightenedBlockEntities1.20 – 1.20.4Hardcore+1.19.4 – 1.20.3Moviemaker1.20 – 1.20.1

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

The typical performance boost is about 2–4%; however, if the server is heavily loaded with items, arrows (on the ground), or mobs within a large radius, the boost can reach 10% or more. This mod is a fork of GPUBooster and was created with the goal of separating server-side functions and moving the original…
Mr.Toad, on the Modrinth page

Official listing

Owner
Mr.Toad
Published
2025-12-18
Updated on Modrinth
2026-10-04
Facts verified
2026-10-15

Tags

MobsOptimizationUtility
Open on ModrinthCompare