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modpack

Ultimately Optimized+Minecraft modpack for 1.21

A very highly optimized modpack made to continue the old ultimately optimized modpack

client onlynewest supported 1.21OptimizationCombatLightweightMultiplayer
Latest version
2.3.6
Minecraft
1.7.10 to 1.21
Java
Java 21+
Loaders
Fabric, Quilt, NeoForge, Forge
Licence
MIT
Downloads
3.2k
Updated
6 mo ago
Available on
Modrinth
Space NodePartner

Host Ultimately Optimized+ servers

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

  • 1.21
  • 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 Ultimately Optimized+ declares support for, newest first, with the Java runtime that version needs.

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21Fabric, Quilt, NeoForge, Forge21+declared13 Jun 2024
1.20.6Forge, Quilt, NeoForge, Fabric21+declared29 Apr 2024
1.19.4Forge, Quilt, NeoForge, Fabric17+declared14 Mar 2023
1.19.2Forge, Quilt, NeoForge, Fabric17+declared5 Aug 2022
1.19.1Forge, Quilt, NeoForge, Fabric17+declared27 Jul 2022
1.19Forge, Quilt, NeoForge, Fabric17+declared7 Jun 2022
1.18.2Fabric, Forge, NeoForge, Quilt17+declared28 Feb 2022
1.17.1Fabric, Quilt, NeoForge, Forge16+declared6 Jul 2021
1.16.5Forge, Quilt, NeoForge, Fabric8+declared14 Jan 2021
1.15.2Forge, Quilt, NeoForge, Fabric8+declared17 Jan 2020
1.14.4NeoForge, Quilt, Forge, Fabric8+declared19 Jul 2019
1.12.2Fabric, Quilt, NeoForge, Forge8+declared18 Sept 2017
1.8.9Forge, Quilt, NeoForge, Fabric8+declared3 Dec 2015
1.7.10NeoForge, Forge, Fabric, Quilt8+declared14 May 2014

Download

From Ultimately Optimized+’s own host. Nothing is re-hosted here.

All 28 releases
2.3.6release23 Mar 2026

Ultimately Optimized+ 1.21 Fabric 2.3.5.mrpack · 0.0 MB · for 1.21

Download latest
a1fe9628202e…
Older versions24
  • 2.3.523 Mar 20261.210.0 MB17 downloads5d333ff815d1…Get
  • 2.3.422 Mar 20261.20.60.0 MB18 downloads7a25412b8cf6…Get
  • 2.3.38 Feb 20261.19.40.0 MB29 downloadscff5d16fc55e…Get
  • 2.3.28 Feb 20261.19.40.0 MB9 downloads0ccf398dd29a…Get
  • 2.3.18 Feb 20261.19.40.0 MB12 downloads0075b3c04dcb…Get
  • 2.3.08 Feb 20261.19.40.0 MB12 downloadsa715f556198a…Get
  • 2.2.78 Feb 20261.19.20.0 MB13 downloads114599026e76…Get
  • 2.2.98 Feb 20261.19.20.0 MB11 downloadsbd0ff7dac483…Get
  • 2.2.88 Feb 20261.19.20.0 MB11 downloads4dcb7b2ffdf9…Get
  • 2.2.68 Feb 20261.19.20.0 MB15 downloads8a62c4b27ee5…Get
  • 2.2.58 Feb 20261.18.20.0 MB44 downloadse98a2595516c…Get
  • 2.2.415 Jun 20251.19.10.0 MB137 downloads73887fcc8d60…Get
  • 2.2.315 Jun 20251.19.10.0 MB31 downloads5658b8233f5a…Get
  • 1.2.227 May 20251.190.0 MB85 downloads4d74fbb9a5aa…Get
  • 1.2.127 May 20251.190.0 MB24 downloadsa65193c0b57f…Get
  • 1.2.027 May 20251.190.0 MB54 downloadsbecc76d8c601…Get
  • 1.1.97 May 20251.18.20.0 MB34 downloadsbdf799a10cba…Get
  • 1.1.87 May 20251.18.20.0 MB37 downloads0ef29b6dd104…Get
  • 1.1.74 May 20251.17.10.0 MB63 downloads6e6dc83f2750…Get
  • 1.1.64 May 20251.17.10.0 MB120 downloadsdb9172d47d56…Get
  • 1.1.526 Apr 20251.16.510.4 MB173 downloads185e4d1791d1…Get
  • 1.1.426 Apr 20251.16.50.0 MB189 downloads04e29089060a…Get
  • 1.1.026 Apr 20251.15.20.0 MB349 downloads56689db2a799…Get
  • 1.0.826 Apr 20251.14.40.0 MB575 downloads85268e86350d…Get

Frequently asked

Does Ultimately Optimized+ work on Minecraft 1.21?

Yes. 1.21 is the newest Minecraft version Ultimately Optimized+ 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 Ultimately Optimized+ support?

Everything the author has declared, from 1.7.10 up to 1.21. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Ultimately Optimized+ 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 Ultimately Optimized+ 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 Ultimately Optimized+?

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 Ultimately Optimized+ under?

MIT, 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 Ultimately Optimized+?

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 Ultimately Optimized+ 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.OptimumFuse[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.ElixirA well-researched performance & optimization modpack to make the game run smoother! With shader & Fresh Animations support. 26.3 rc1 ✔

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.

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