FabricFastMath

OptiFine's Fast Math feature re-implemented as a Fabric mod.

2.1K Downloads

fabricquiltoptimization

Rent Server with this Mod

About this Mod

FastMathFabric

OptiFine's Fast Math feature re-implemented as a Fabric mod.

Description

This mod replaces vanilla Minecraft's trigonometric functions with faster,
optimized versions, similar to the "Fast Math" feature found in OptiFine. It
aims to improve performance by reducing the computational cost of math
operations.

Compatibility

Minecraft Version: 1.21.11
Fabric Loader: Required

Performance Statistics

Methodology

The game was allowed to stabilize for 1 minute. FPS data was then collected
every 10 seconds for a total of 10 samples.

Results

Environment	FPS (Without Mod)	FPS (With Mod)	Improvement
Multiplayer Server	504	591	+17.2%
Singleplayer Server	665	670	+0.75%

Installation

Install Fabric Loader.
Download the FastMathFabric jar file.
Place the jar file in your .minecraft/mods folder.
Launch the game using the Fabric profile.

License

This project is licensed under the Mozilla Public License Version 2.0.

Available Versions

FabricFastMath 0.0.4release

MC 1.21.11fabric, quilt

January 7, 2026

FabricFastMath 0.0.3release

MC 1.21.11fabric

December 31, 2025

How to Install FabricFastMath on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

Install Mod

Open the mod browser in the dashboard and search for "FabricFastMath". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabricquilt

Minecraft Versions

1.21.11

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

FabricFastMath server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.

Is FabricFastMath compatible with fabric and quilt?

FabricFastMath officially supports fabric, quilt for Minecraft 1.21.11. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with FabricFastMath – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if FabricFastMath consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.