Menu

modpack

OptimumFuseMinecraft modpack for 1.21.5

[1.21.5] [Fabric📜] An open-source modpack that improves the game's performance and visuals, inspired by OptiFine, while staying true to the vanilla Minecraft experience.

client onlynewest supported 1.21.5OptimizationLightweightMultiplayer
Latest version
1.16.0+fabric.1.21.1
Minecraft
1.16.5 to 1.21.5
Java
Java 21+
Loaders
Fabric, Quilt, NeoForge, Forge
Licence
Apache-2.0
Downloads
40.5k
Updated
10 mo ago
Available on
Modrinth
Space NodePartner

Host OptimumFuse servers

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

  • 1.21.5
  • Fabric
  • Quilt
  • NeoForge
  • Forge
  • One click modpack install
  • Dependencies handled
  • Tuned startup flags
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

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

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21.5Fabric, Quilt, NeoForge, Forge21+declared25 Mar 2025
1.21.4Forge, Quilt, NeoForge, Fabric21+declared3 Dec 2024
1.21.3Forge, Quilt, NeoForge, Fabric21+declared23 Oct 2024
1.21.1Forge, Quilt, NeoForge, Fabric21+declared8 Aug 2024
1.21Forge, Quilt, NeoForge, Fabric21+declared13 Jun 2024
1.20.6Fabric, Forge, NeoForge, Quilt21+declared29 Apr 2024
1.20.6-rc1Fabric, Quilt, NeoForge, Forge21+declared26 Apr 2024
1.20.5Forge, Quilt, NeoForge, Fabric21+declared23 Apr 2024
1.20.4Fabric, Quilt, NeoForge, Forge17+declared7 Dec 2023
1.20.2Fabric, Quilt, NeoForge, Forge17+declared20 Sept 2023
1.20.1Forge, Quilt, NeoForge, Fabric17+declared12 Jun 2023
1.16.5Quilt, Forge, NeoForge, Fabric8+declared14 Jan 2021

Download

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

All 60 releases
1.16.0+fabric.1.21.1release5 Nov 2025

OptimumFuse 1.16.0+fabric.1.21.1.mrpack · 0.4 MB · for 1.21.1

Download latest
ec3e68846d2f…
Older versions24
  • 1.15.0-beta.3+fabric.1.21.513 Jun 20251.21.50.8 MB1.2k downloadsd83087df3d22…Get
  • 1.15.0-beta.2+fabric.1.21.524 May 20251.21.50.8 MB310 downloadsab3d44c9e5c0…Get
  • 1.15.0-beta.1+fabric.1.21.515 May 20251.21.50.8 MB180 downloads938fe7e66428…Get
  • 1.14.6+fabric.1.21.47 May 20251.21.40.4 MB462 downloads1ac5677693a1…Get
  • 1.14.5+fabric.1.21.410 Apr 20251.21.40.4 MB381 downloads11ef8306fd3c…Get
  • 1.14.4+fabric.1.21.41 Apr 20251.21.40.4 MB195 downloads1b9b4ad9f14e…Get
  • 1.14.3+fabric.1.21.431 Mar 20251.21.40.4 MB56 downloadsda59b57e81cb…Get
  • 1.14.2+fabric.1.21.421 Mar 20251.21.40.4 MB173 downloads1fc00538e23e…Get
  • 1.14.1+fabric.1.21.410 Mar 20251.21.40.4 MB226 downloadsc63ea699e4ca…Get
  • 1.14.0+fabric.1.21.41 Mar 20251.21.40.4 MB223 downloadsb28efb087c70…Get
  • 1.14.0-beta.13+fabric.1.21.413 Feb 20251.21.40.4 MB319 downloads908a7f52e728…Get
  • 1.14.0-beta.12+fabric.1.21.410 Feb 20251.21.40.5 MB75 downloadscce17e86e198…Get
  • 1.14.0-beta.11+fabric.1.21.44 Feb 20251.21.40.4 MB124 downloadsd0d8e3a357a3…Get
  • 1.14.0-beta.10+fabric.1.21.430 Jan 20251.21.40.3 MB118 downloads0bcc7b66d901…Get
  • 1.14.0-beta.9+fabric.1.21.424 Jan 20251.21.40.5 MB116 downloadsb258ed74520e…Get
  • 1.14.0-beta.8+fabric.1.21.418 Jan 20251.21.40.5 MB111 downloadsb65f6c9d73a3…Get
  • 1.14.0-beta.7+fabric.1.21.415 Jan 20251.21.40.5 MB98 downloads4d02b5f83c82…Get
  • 1.14.0-beta.6+fabric.1.21.412 Jan 20251.21.40.6 MB85 downloads4254ba4d8194…Get
  • 1.14.0-beta.5+fabric.1.21.328 Dec 20241.21.30.8 MB262 downloads8bcdcbf62ada…Get
  • 1.14.0-beta.4+fabric.1.21.323 Dec 20241.21.30.8 MB89 downloads01747461ba5f…Get
  • 1.14.0-beta.3+fabric.1.21.319 Dec 20241.21.30.7 MB95 downloads3257f20308c9…Get
  • 1.14.0-beta.2+fabric.1.21.316 Dec 20241.21.30.7 MB67 downloadsee2c1b82a617…Get
  • 1.14.0-beta.1+fabric.1.21.310 Dec 20241.21.30.7 MB91 downloadsab5b2837f0d9…Get
  • 1.13.5+fabric.1.21.130 Nov 20241.21.10.1 MB539 downloadsb047569ca407…Get

Frequently asked

Does OptimumFuse work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version OptimumFuse 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 OptimumFuse support?

Everything the author has declared, from 1.16.5 up to 1.21.5. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install OptimumFuse on the client or the server?

The client only. There is nothing to install on the server, so it works on any server you can already join.

Which loader does OptimumFuse need?

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

Which Java version do I need for OptimumFuse?

Java 21 or newer, because that is what the newest Minecraft release it supports requires. The requirement comes from the game rather than from the modpack itself.

What licence is OptimumFuse under?

Apache-2.0, 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 OptimumFuse?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the modpack 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 OptimumFuse safely?

From the author's own page on Modrinth, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

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

Re-ConsoleA continued Legacy Console Edition experience, expanded upon with modern Java Edition content and QoL! (An Official Legacy4J Project)MAX FPS: Optimized🚀 MAX FPS WITHOUT UNNECESSARY MODS! Only 16 optimization mods - NOTHING EXTRA! ✅ ALL MAJOR VERSIONS ⚡ INSTALLS ON ANY LAUNCHER! (Guide below)PacktrixPre-packed Official Modpack containing Patrix Resource Pack for easy install using Fabric/Quilt.Simply Optimized ReloadedAn unofficial port of Simply Optimized built to support every major mod loader and stay current with the newest versions of Minecraft.ElixirA well-researched performance & optimization modpack to make the game run smoother! With shader & Fresh Animations support. 26.3 rc1 ✔fps+pvpFPS + PvP Boost is a lightweight Minecraft modpack designed to maximize performance and give players a competitive edge in PvP. With FPS-boosting optimizations and combat-focused tweaks, it delivers smoother gameplay, better responsiveness, and enhanced vi

Last checked 2 mo ago against Modrinth. 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? .