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mod

KAllFixMinecraft mod for 1.21.1

Optimization and multithreading written by n1luik

newest supported 1.21.1UtilityLibraryOptimization
Latest version
1.1.0.2
Minecraft
1.19.2 to 1.21.1
Java
Java 21+
Loaders
Forge, NeoForge
Licence
GPL-2.0-only
Downloads
14.6k
Updated
16 d ago
Available on
Modrinth
Space NodeOur hosting

Host KAllFix servers

One click and KAllFix is installed with the right loader, on hardware built for it.

  • 1.21.1
  • Forge
  • NeoForge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version KAllFix declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Forge, NeoForge21+declared8 Aug 2024
1.21Forge, NeoForge21+declared13 Jun 2024
1.20.1Forge, NeoForge17+declared12 Jun 2023
1.19.2Forge, NeoForge17+declared5 Aug 2022

Download

From KAllFix’s own host. Nothing is re-hosted here.

All 54 releases
1.1.0.2alpha18 Jul 2026

k_multi_threading-NeoForge-1.1.0.2.jar · 4.4 MB · for 1.21.1, 1.21

Download latest
39f240e1dac1…
Older versions24
  • 1.1.0.115 Jul 20261.20.1, 1.19.24.4 MB45 downloadsbf73992f25ac…Get
  • 1.1.0.08 Jul 20261.20.1, 1.19.24.4 MB46 downloads1afed17c4c3e…Get
  • 1.0.5.1430 May 20261.20.1, 1.19.24.2 MB1.9k downloads740f30946ece…Get
  • 1.0.5.1329 May 20261.20.1, 1.19.24.2 MB59 downloads6b834dc680e0…Get
  • 1.0.5.1230 Apr 20261.20.1, 1.19.24.2 MB1.0k downloads8102b26e8e44…Get
  • 1.0.5.1117 Apr 20261.20.1, 1.19.24.2 MB246 downloadsf9a5666af9b3…Get
  • 1.0.5.101 Apr 20261.20.1, 1.19.24.2 MB288 downloads342269c7bf95…Get
  • 1.0.5.91 Apr 20261.20.1, 1.19.24.2 MB16 downloadsb1652b7f2df5…Get
  • 1.0.5.81 Apr 20261.20.1, 1.19.24.2 MB21 downloadsa8c3835cac06…Get
  • 1.0.5.720 Mar 20261.20.1, 1.19.24.2 MB383 downloadseba73fb9f3ad…Get
  • 1.0.5.69 Mar 20261.20.1, 1.19.24.2 MB191 downloads752668d03543…Get
  • 1.0.5.525 Jan 20261.20.1, 1.19.24.2 MB750 downloadsd1bc39008a47…Get
  • 1.0.5.419 Jan 20261.20.1, 1.19.24.2 MB163 downloadse773dffb8a05…Get
  • 1.0.5.316 Jan 20261.20.1, 1.19.24.1 MB153 downloadsabcf1f8e19c0…Get
  • 1.0.5.22 Jan 20261.20.14.1 MB246 downloads64318e9a33ca…Get
  • 1.0.5.129 Dec 20251.20.14.1 MB171 downloadsf00dadddd70f…Get
  • 1.0.5.024 Dec 20251.20.14.1 MB123 downloadsd0138dc50de7…Get
  • 1.0.4.911 Dec 20251.20.1, 1.19.24.0 MB310 downloads9414370b4b5c…Get
  • 1.0.4.85 Dec 20251.20.1, 1.19.24.0 MB174 downloads48796b41c511…Get
  • 1.0.4.72 Dec 20251.20.1, 1.19.24.0 MB104 downloads1a2c61ce971b…Get
  • 1.0.4.623 Nov 20251.20.14.0 MB171 downloads549047b75988…Get
  • 1.0.4.54 Nov 20251.20.14.0 MB198 downloads9746688eba73…Get
  • 1.0.4.431 Oct 20251.20.14.0 MB93 downloads41dcd0bcf89d…Get
  • 1.0.4.326 Oct 20251.20.14.0 MB66 downloads353085c1e092…Get

Frequently asked

Does KAllFix work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version KAllFix declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does KAllFix support?

Everything the author has declared, from 1.19.2 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does KAllFix support?

Forge, NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for KAllFix?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is KAllFix under?

GPL-2.0-only, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install KAllFix?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download KAllFix safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from Modrinth, where the author last updated it on 13 Sept 2026. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .