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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 release 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
7 mo ago
Available on
Modrinth

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.

Browse 28 indexed releases

For Minecraft 1.21

Choose the loader you use before downloading.

  • Fabric

    2.3.6 · 23 Mar 2026 · Ultimately Optimized+ 1.21 Fabric 2.3.5.mrpack

    Get Fabric

  • NeoForge

    2.3.5 · 23 Mar 2026 · Ultimately Optimized+ 1.21 NeoForge 2.3.5.mrpack

    Get NeoForge

Most recently published release

2.3.6release23 Mar 2026

Ultimately Optimized+ 1.21 Fabric 2.3.5.mrpack · 16 KB · for 1.21 · Fabric

Download this release
a1fe9628202e…
Older versions24
  • 2.3.523 Mar 20261.2113 KB17 downloads5d333ff815d1…Get
  • 2.3.422 Mar 20261.20.617 KB18 downloads7a25412b8cf6…Get
  • 2.3.38 Feb 20261.19.419 KB29 downloadscff5d16fc55e…Get
  • 2.3.28 Feb 20261.19.412 KB9 downloads0ccf398dd29a…Get
  • 2.3.18 Feb 20261.19.417 KB12 downloads0075b3c04dcb…Get
  • 2.3.08 Feb 20261.19.430 KB12 downloadsa715f556198a…Get
  • 2.2.78 Feb 20261.19.211 KB13 downloads114599026e76…Get
  • 2.2.98 Feb 20261.19.222 KB11 downloadsbd0ff7dac483…Get
  • 2.2.88 Feb 20261.19.222 KB11 downloads4dcb7b2ffdf9…Get
  • 2.2.68 Feb 20261.19.218 KB15 downloads8a62c4b27ee5…Get
  • 2.2.58 Feb 20261.18.222 KB44 downloadse98a2595516c…Get
  • 2.2.415 Jun 20251.19.110 KB137 downloads73887fcc8d60…Get
  • 2.2.315 Jun 20251.19.115 KB31 downloads5658b8233f5a…Get
  • 1.2.227 May 20251.198 KB85 downloads4d74fbb9a5aa…Get
  • 1.2.127 May 20251.1910 KB24 downloadsa65193c0b57f…Get
  • 1.2.027 May 20251.1915 KB54 downloadsbecc76d8c601…Get
  • 1.1.97 May 20251.18.215 KB34 downloadsbdf799a10cba…Get
  • 1.1.87 May 20251.18.211 KB37 downloads0ef29b6dd104…Get
  • 1.1.74 May 20251.17.113 KB63 downloads6e6dc83f2750…Get
  • 1.1.64 May 20251.17.17 KB120 downloadsdb9172d47d56…Get
  • 1.1.526 Apr 20251.16.510.4 MB173 downloads185e4d1791d1…Get
  • 1.1.426 Apr 20251.16.514 KB189 downloads04e29089060a…Get
  • 1.1.026 Apr 20251.15.26 KB349 downloads56689db2a799…Get
  • 1.0.826 Apr 20251.14.46 KB575 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 side. That is the author's declared design, not a guarantee for every server: one running anti-cheat or missing a counterpart mod can still object.

Which platform or loader does Ultimately Optimized+ support?

Fabric, Quilt, NeoForge, Forge. 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 Ultimately Optimized+?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

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+?

Use a launcher that imports packs, such as Prism Launcher, the Modrinth App or the CurseForge app, and open the pack file with it. The launcher installs the right loader and mods for you; installing a pack's mods by hand is the error-prone way.

Where do I download Ultimately Optimized+ 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. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

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)Simply Optimized ReloadedAn unofficial port of Simply Optimized built to support every major mod loader and stay current with the newest versions of Minecraft.PacktrixPre-packed Official Modpack containing Patrix Resource Pack for easy install using Fabric/Quilt.ElixirA well-researched performance & optimization modpack to make the game run smoother! With shader & Fresh Animations support. 26.3 ✔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.

Details from Modrinth, where the author last updated it on 23 Mar 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .