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FastMathFabric

by FwuffyPetsOwO

FastMathFabric swaps the game's trigonometry for a faster small-angle approximation, following the idea behind OptiFine's Fast Math option.

FabricClient-side onlyApache License 2.0Open source1.17.1 – 1.18

What it does

On Fabric, the mod replaces the sine and cosine calculations with a small-angle approximation, where sin x is taken as x and cos x as 1 for small angles. This trades some accuracy for speed in the math the client performs. The author describes it as a Fabric port of OptiFine's Fast Math feature. It is client-side only, so only the client needs it and servers run without it. Files target Fabric and 1.17.1 and 1.18, and the latest is 0.2 for 1.18, released under the Apache License 2.0 and open source.

Key features

  1. Small-angle sine

    Sine is computed as x for small angles, in place of the full calculation.

  2. Cosine shortcut

    Cosine is set to 1 for small angles, which is the second part of the approximation.

  3. Source available

    The source code is public, so the approximation can be read and changed.

Compatibility

Latest build for each game version and loader.

1.180.2
1.17.10.0.1
ReleaseBetaAlphaNot available

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

How it compares

Full comparison

QuickMäth is a Fabric mod for 1.16.4 – 26.3 under the MIT License and open source, and it can run on a client or a server, with neither side required. Agony is open source under the MIT License, works on Fabric and Quilt for 1.14 – 1.21, and is also optional on either side. Captcha is open source under the MIT License, supports Fabric, Forge and NeoForge for 1.18.2 – 26.3, and must be installed on both client and server.

ModLoadersGame versionsEnvironmentUpdated
FastMathFabricFabric1.17.1 – 1.18Client-side only2021-12-08
QuickMäthFabric1.16.4 – 26.3Client or server, optional2026-09-15
AgonyFabric and Quilt1.14 – 1.21Client or server, optional2023-12-09
CaptchaFabric, Forge and NeoForge1.18.2 – 26.3Client and server2026-09-30

Questions

Is FastMathFabric incompatible with Lithium OptiFabric?

Yes. The author notes that the mod does not work alongside Lithium OptiFabric, so the two should not be installed together.

In the catalog

FastMathFabric is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 3,927 mods support Minecraft 1.18.

Cursed mods7,555Fabric modsMods for 1.183,927

More from FwuffyPetsOwO

All projects
Colorstone1.17 – 1.18.1

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What the author says

FastMathFabric replicates OptiFine's Fast Math feature as a Fabric mod. It is incompatible with Lithium and OptiFabric. Note: the "SmallAngleMath" file is even more cursed - instead of OptiFine's Fast Math, it replaces the math with the small-angle approximation (sin x = x, cos x = 1)
FwuffyPetsOwO, on the Modrinth page

Official listing

Owner
FwuffyPetsOwO
Published
2021-10-17
Updated on Modrinth
2021-12-08
Facts verified
2026-10-15

Tags

Cursed
Open on ModrinthCompare