Modrinth · Minecraft modpack

Optimized Core

This is a modpack core that optimizes the game. Mainly meant as a base for your own modpack/instance. It only contains optimization mods and for this reason it achives the BEST performance of any modpack!

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which Optimized Core release matches 1.21.6?

Updated 2 days ago

Best match for your filters Optimized Core Backport MC 1.21.6

Game version 1.21.6

Loader Fabric 0.19.2

Optimized Core Backport MC 1.21.6 is a complete pack release for 1.21.6 with Fabric 0.19.2. Install it as its own launcher instance. If the creator publishes a separate server file, make sure it names this exact pack release. 33 mods in this pack file.

Pack setup

How should I set up Optimized Core for players and a server?

Use Optimized Core Backport MC 1.21.6 as the pack version. Install the pack as its own launcher instance. The creator’s listing does not name a separate server file, so check the release notes before setting up a dedicated server. Do not upload the ordinary client folder blindly.

Client instance Install Optimized Core Backport MC 1.21.6

Dedicated server setup Match Optimized Core Backport MC 1.21.6

Pack loader Fabric 0.19.2

A pack is a matched client and server setup, not one mod with an install-side label. Keep its release, loader, manifest and overrides together.

Plan the server requirements Read the Minecraft installation guide

Referenced mods 33

Client only 15

Server only 4

Not labelled 14

These numbers come from the pack file you chose. “Not labelled” means we don’t know which side it belongs on—not that it is safe everywhere. The file count is not a RAM estimate.

What are the server requirements for Optimized Core?

Optimized Core Backport MC 1.21.6 on 1.21.6. The pack contents and setup notes below stay tied to that release.

33 mods in this pack file

The selected pack release is Optimized Core Backport MC 1.21.6. That file is for Minecraft 1.21.6 with Fabric 0.19.2. It contains 33 mod projects. The creator’s listing does not name a separate server file. Check their notes before using one, and do not upload an ordinary client folder or rebuild the pack mod by mod. A file count cannot tell us the right RAM, CPU or storage; size the server for the players and world you actually run.

About this project

What kind of pack is Optimized Core?

The pack

It optimizes the game with the bare minimum amount of mods for best performance.

It is mainly meant to be used as a core for modpacks/instances

It would be helpful if you could follow the project :)

Updates:

It is updated as soon as i have time for it or it's logical.

This is usually 1-7 days.

Requirements:

Java 17+ on all versions after 1.8.9

Features:

▶️╏BEST performance among all modpacks!
▶️╏It can run on a mere 360MB ram (when playing on servers)
▶️╏Adds every essential optimization mod
▶️╏Very simple!
▶️╏Very small size
▶️╏You can build whatever you want out of it

No configs included

Support&Contacting me:

Contacting me:

Via Email: void_98.direness683@passinbox.com Business inquiries only via email!
In the discord server.

I provide support via both

Credits:

Icon by: Luceria

Project description from Modrinth.

Mods in Optimized Core Backport MC 1.21.6

Open any mod on Modpacks.ch to check its files and dependencies.

BadOptimizations-2.4.1-1.21.6-21.8.jar SHA-1 0b50a4b71ab6945a7c6843429628e7122e9962ed · Modrinth version 9s4ZpGFq · Project link unavailable Client only

bbe-1.2.0+1.21.8.jar SHA-1 ac3a7d05b5496bc757a73ec0958c4cd1b4f8ae47 · Modrinth version nZ02Iiki · Project link unavailable Client only

BetterRenderDistance-1.2.0+mc1.21.6-1.21.8.jar SHA-1 446a028b113d089fdf1b93dcf85be88b260f7e9c · Modrinth version U7W9Fttt · Project link unavailable Client only

c2me-fabric-mc1.21.8-0.3.4.0.0.jar SHA-1 0951ad76de856b2e8804f06efc4302f828dc3bff · Modrinth version tlZRTK1v · Project link unavailable Side not labelled

cloth-config-19.0.147-fabric.jar SHA-1 d3bd78860580da556990726af3bed1169e69933e · Modrinth version cz0b1j8R · Project link unavailable Side not labelled

entityculling-fabric-1.8.2-mc1.21.6.jar SHA-1 56c5a0617863c53cf7e338d6ff862d02801a1f75 · Modrinth version 5wVZFo2d · Project link unavailable Client only

fabric-api-0.128.2+1.21.6.jar SHA-1 b273a883a3864108453a5d5f0b9e4f0a870c9579 · Modrinth version F5TVHWcE · Project link unavailable Side not labelled

fabric-language-kotlin-1.13.11+kotlin.2.3.21.jar SHA-1 b6190b247c557c493dc4204121744f289a1d1837 · Modrinth version 2i87JpYj · Project link unavailable Side not labelled

fast-ip-ping-v1.0.11-mc1.21.8-fabric.jar SHA-1 da6c95208f751c96d8130747880e3995d8afba71 · Modrinth version LFUtSgNM · Project link unavailable Client only

ferritecore-8.0.4-fabric.jar SHA-1 974662c047d5eaa34d372be09409b8b754c223f4 · Modrinth version LdlksamY · Project link unavailable Side not labelled

fzzy_config-0.7.6+1.21.6.jar SHA-1 22e167ab37bf246d63d1b851a5176b942de80a37 · Modrinth version Ocbwe0sY · Project link unavailable Side not labelled

GpuTape-1.0.6.1-1.21.5.jar SHA-1 1edc85f646ff18d6a0be03c349241a6be7a250af · Modrinth version dV5wJGOp · Project link unavailable Client only

ImmediatelyFast-Fabric-1.10.3+1.21.6.jar SHA-1 ad17f085506040b3be320cde489b365f4c7484f6 · Modrinth version 9JPEk4KN · Project link unavailable Client only

Ixeris-4.2.0+1.21.8-fabric.jar SHA-1 4d29b0c2e5102d7aa8ba73e6c30187e5d57a9056 · Modrinth version pTXvuVa3 · Project link unavailable Client only

krypton-0.2.9.jar SHA-1 45a1cba4e4fbd1e4885583699739bd8ad73ba5e6 · Modrinth version neW85eWt · Project link unavailable Side not labelled

Ksyxis-1.4.3.jar SHA-1 6f4b2ea7827da8136bdf436457a2ba3fcdb2120e · Modrinth version kL32PN9Q · Project link unavailable Server only

language-reload-1.7.6+1.21.8.jar SHA-1 8cb11b5b79df96197b7a9bf84b1eb7f945a03207 · Modrinth version tmnjNpE6 · Project link unavailable Client only

lazy-language-loader-0.3.8.jar SHA-1 59b42ca37534b61207f4be8137ed336046a93545 · Modrinth version dSqw5J7H · Project link unavailable Client only

lithium-fabric-0.17.0+mc1.21.6.jar SHA-1 78f513f63036bc8fa061b5ee1aa88d5779f5a52c · Modrinth version XWGBHYcB · Project link unavailable Side not labelled

modernfix-fabric-5.20.4-1.21.6.jar SHA-1 784e691d6635abb0ed82764a9502aae3fb96b260 · Modrinth version ve3rdBen · Project link unavailable Side not labelled

moreculling-fabric-1.21.8-1.4.0-beta.2.jar SHA-1 30123de3b8a09db46968d721c7892f5fb2b6d292 · Modrinth version ivOsScf8 · Project link unavailable Client only

particle_core-0.3.3+1.21.6.jar SHA-1 33876da7a1d86bceedc34d3e56ba9deb3b60b7bb · Modrinth version Gjb9nYK0 · Project link unavailable Client only

quick-pack-fabric-1.3.2+1.21.8.jar SHA-1 81905d4129243cf1154a030f21317df40632a48b · Modrinth version Zt6WZuGh · Project link unavailable Side not labelled

ResourcefulConfig-fabric-1.21.7-3.7.3.jar SHA-1 07538489c53399ea7fa9b03a43a885c6f2ec5deb · Modrinth version Juv6PsWA · Project link unavailable Side not labelled

ScalableLux-0.1.5.1+fabric.abdeefa-all.jar SHA-1 c8871a354138763af96e96b1792ffa81a82e8289 · Modrinth version Bi5i8Ema · Project link unavailable Side not labelled

servercore-fabric-1.5.13+1.21.6.jar SHA-1 a32e3322f99f0e26ce3d2c299ed4016c66959417 · Modrinth version tYpkAekN · Project link unavailable Server only

sodium-fabric-0.7.3+mc1.21.8.jar SHA-1 c9ed2b00385ea191e81ea4da51c008755fe90a26 · Modrinth version 7pwil2dy · Project link unavailable Client only

structure_layout_optimizer-1.1.4+1.21.6-fabric.jar SHA-1 05dc716d65bbb99677c48437b82997074c84b14e · Modrinth version qvfSaFES · Project link unavailable Server only

stutterfix-1.0.0.jar SHA-1 b6551015ddb58123f406f5fcd0978447e65f7d06 · Modrinth version 3GROOWjh · Project link unavailable Side not labelled

substrate-4.2+1.21.1-fabric.jar SHA-1 08641e4e72683ddd2ad38a7353530051b89198a9 · Modrinth version LZqCApee · Project link unavailable Client only

superfastmath-0.0.2-1.21.6.jar SHA-1 c0bf5b762f4ead982d880b369c968b86451f5b5c · Project link unavailable Client only

Recent files

Optimized Core versions and loaders

1 of 151 releases match

Optimized Core Backport MC 1.21.6

11 May 2026

Check the 1.21.6 · Fabric setup

Fabric 0.19.21.21.68.0.312+7 release

Download on Modrinth

Looking for an older file? The official Modrinth project page is in Resources.

Optimized Core

Which Optimized Core release matches 1.21.6?

How should I set up Optimized Core for players and a server?

What are the server requirements for Optimized Core?

What kind of pack is Optimized Core?

The pack

Updates:

Requirements:

Features:

Contacting me:

Credits:

Mods in Optimized Core Backport MC 1.21.6

Optimized Core by Minecraft version and loader

26.3

26.2

26.1.2

26.1.1

26.1

1.21.11

1.21.10

1.21.9

1.21.8

1.21.7

1.21.6

1.21.5

Optimized Core versions and loaders

Optimized Core Backport MC 1.21.6

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