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modpack

Extreme Optimization!Minecraft modpack for 1.21.4

Threaten your game to run faster

newest supported release 1.21.4OptimizationLightweightMultiplayer
Latest version
C1.21.1NF.2
Minecraft
1.12.2 to 1.21.4
Java
Java 21+
Loaders
Fabric, NeoForge, Quilt, Forge
Licence
CC-BY-NC-4.0
Downloads
37.3k
Updated
5 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Extreme Optimization! servers

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

  • 1.21.4
  • Fabric
  • NeoForge
  • Quilt
  • Forge
  • One click modpack install
  • Dependencies handled
  • Tuned startup flags
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Extreme Optimization! declares support for, newest first, with the Java runtime that version needs.

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21.4Fabric, NeoForge, Quilt, Forge21+declared3 Dec 2024
1.21.1Fabric, Quilt, NeoForge, Forge21+declared8 Aug 2024
1.20.2Fabric, Quilt, NeoForge, Forge17+declared20 Sept 2023
1.20.1Forge, Quilt, NeoForge, Fabric17+declared12 Jun 2023
1.19.4NeoForge, Fabric, Forge, Quilt17+declared14 Mar 2023
1.19.2Fabric, Quilt, NeoForge, Forge17+declared5 Aug 2022
1.18.2Forge, Quilt, NeoForge, Fabric17+declared28 Feb 2022
1.16.5Forge, Quilt, NeoForge, Fabric8+declared14 Jan 2021
1.12.2Forge, Quilt, NeoForge, Fabric8+declared18 Sept 2017

Download

From Extreme Optimization!’s own host. Nothing is re-hosted here.

Browse 29 indexed releases

For Minecraft 1.21.4

Choose the loader you use before downloading.

  • NeoForge

    S1.21.4NF · 10 Mar 2025 · Server1.21.4NeoForge.mrpack

    Get NeoForge

Most recently published release

C1.21.1NF.2beta9 Jun 2026

C1.21.1NF.2.mrpack · 13 KB · for 1.21.1 · NeoForge

Download this release
18217b4c24b1…
Older versions24
  • CS1.12.2FJ89 Apr 20251.12.20.7 MB3.2k downloads58a338c5b595…Get
  • CS1.12.2FJ21+9 Apr 20251.12.20.7 MB513 downloads065df010fa44…Get
  • S1.12.2FJ88 Apr 20251.12.20.2 MB183 downloadsad04fd7c0e50…Get
  • S1.21.1NF.210 Mar 20251.21.10.1 MB1.5k downloadsc7e694f9e76e…Get
  • S1.21.4NF10 Mar 20251.21.43 KB547 downloads215ad4aefd57…Get
  • C1.21.4NF10 Mar 20251.21.46 KB198 downloads230360295e0d…Get
  • C1.21.1NF25 Feb 20251.21.16 KB805 downloadsa83508d02e3a…Get
  • S1.21.1NF19 Feb 20251.21.10.1 MB600 downloads4f8453651e54…Get
  • 1.20.2ForgeTPLRE30 Nov 20231.20.22 KB3.9k downloadsded13eae3f75…Get
  • 1.20.2ForgeVLRE30 Nov 20231.20.22.2 MB291 downloadse28af254629c…Get
  • 1.20.2FTPLRE28 Nov 20231.20.25 KB433 downloadse7ec56d2b1d7…Get
  • 1.20.1QTPLRE5 Aug 20231.20.18 KB2.7k downloadsbe78d5a7e9b1…Get
  • 1.12.2ForgeVL3.02 Aug 20231.12.26.8 MB8.1k downloadse19d2ff27c2d…Get
  • 1.12.2ForgeTPL3.02 Aug 20231.12.24.0 MB1.5k downloads4825f473ee48…Get
  • 1.19.4QTPL18 May 20231.19.410 KB732 downloads2e9267c8daf2…Get
  • 1.19.4QVL18 May 20231.19.412.0 MB298 downloads67ffc631d124…Get
  • 1.12.2ForgeTPL2.021 Mar 20231.12.22.1 MB2.3k downloads0afc80f69f66…Get
  • 1.12.2ForgeVL2.021 Mar 20231.12.25.1 MB717 downloads21c1c7460872…Get
  • 1.12.2ForgeVL20 Nov 20221.12.24.9 MB1.1k downloads66a428d1d737…Get
  • 1.12.2ForgeTPL20 Nov 20221.12.21.7 MB694 downloadscb0480a02942…Get
  • 1.16.5FTPL20 Nov 20221.16.576 KB2.5k downloads24e1259ed27d…Get
  • 1.16.5FQVL20 Nov 20221.16.57.3 MB1.3k downloadsa51181d4aa21…Choose file on publisher ↗
  • 1.18.2FTPL19 Nov 20221.18.20.2 MB675 downloads295deed9588c…Get
  • 1.18.2FQVL19 Nov 20221.18.212.2 MB404 downloadse0e4e53d00cc…Choose file on publisher ↗

Frequently asked

Does Extreme Optimization! work on Minecraft 1.21.4?

Yes. 1.21.4 is the newest Minecraft version Extreme Optimization! 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 Extreme Optimization! support?

Everything the author has declared, from 1.12.2 up to 1.21.4. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does Extreme Optimization! support?

Fabric, NeoForge, Quilt, 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 Extreme Optimization!?

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 Extreme Optimization! under?

CC-BY-NC-4.0, 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 Extreme Optimization!?

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 Extreme Optimization! 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.香草精华 Vanilla EssenceFaithful to the origional. Better vanilla experience without any new blocks or mobs[BRE] Block Railway Engineering: MTR, Create, IR and more!The Full-contents Edition and Fly Edition of the Block Railway Engineering Modpack, including MTR, Create and other basic mods for players to create a railway world.

Details from Modrinth, where the author last updated it on 9 Jun 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? .