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modpack

OptimalsationMinecraft modpack for 1.21.1

The highest performing 1.21 modpack

client onlynewest supported 1.21.1OptimizationLightweightMultiplayer
Latest version
2.1
Minecraft
1.19.2 to 1.21.1
Java
Java 21+
Loaders
Fabric, Quilt, NeoForge, Forge
Licence
AGPL-3.0-only
Downloads
10.7k
Updated
7 mo ago
Available on
Modrinth
Space NodePartner

Host Optimalsation servers

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

  • 1.21.1
  • Fabric
  • Quilt
  • NeoForge
  • Forge
  • One click modpack install
  • Dependencies handled
  • Tuned startup flags
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

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

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21.1Fabric, Quilt, NeoForge, Forge21+declared8 Aug 2024
1.20.4Fabric, Forge, NeoForge, Quilt17+declared7 Dec 2023
1.20.1Quilt, Fabric, Forge, NeoForge17+declared12 Jun 2023
1.19.2Fabric, Quilt, NeoForge, Forge17+declared5 Aug 2022

Download

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

2.1release19 Dec 2025

Optimax - FPS + QoL + Tweaks.mrpack · 6.2 MB · for 1.21.1

Download latest
b1c2bab6f2bf…
Older versions4
  • 2.014 Dec 20251.21.10.0 MB220 downloads7f5688ec2844…Get
  • 1.20.112 Jun 20241.20.124.9 MB1.3k downloadsaa4f74f0751d…Get
  • 1.20.414 May 20241.20.40.9 MB1.1k downloads5e630a27e952…Get
  • 1.19.214 May 20241.19.20.9 MB415 downloadsee3cd5ca5875…Get

Frequently asked

Does Optimalsation work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Optimalsation 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 Optimalsation 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.

Do I need to install Optimalsation 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 Optimalsation 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 Optimalsation?

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 Optimalsation under?

AGPL-3.0-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 Optimalsation?

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 Optimalsation 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.Photon OptimizationMinecraft optimization framework prioritizing performance, simplicity, and compatibility. 1.7.10-26.1.2 across Fabric, Forge, NeoForge, and Quilt!

Last checked 6 d 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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