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Mods Optimizer project artwork

CurseForge · Minecraft mod

Mods Optimizer

Automatic and real-time server bundling (one mod pack for client/server) and mod clean up for better performance and less crashes.

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

Quick answer

Which Mods Optimizer release should I use?

Updated 2 months ago
Latest stable file mods_optimizer-forge-1.21.11-4.3.0.jar
Game version 1.21.11
Loader Forge

Mods Optimizer mods_optimizer-forge-1.21.11-4.3.0.jar targets 1.21.11 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is Mods Optimizer required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release Forge
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

What else does Mods Optimizer mods_optimizer-forge-1.21.11-4.3.0.jar need?

mods_optimizer-forge-1.21.11-4.3.0.jar. Change the file and its required mods may change too.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add Mods Optimizer without breaking your instance.

Built for Mods Optimizer mods_optimizer-forge-1.21.11-4.3.0.jar. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use mods_optimizer-forge-1.21.11-4.3.0.jar. It targets 1.21.11 with Forge; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    This file does not list any required mods. Do not add a library just because a different file uses it.

  3. 03

    Put it on the correct side

    The project page does not say whether this file belongs on the client, dedicated server, or both.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside mods_optimizer-forge-1.21.11-4.3.0.jar. It opens that exact file at the source.

About this project

What does Mods Optimizer add?

Mods Optimizer

Note: This is the next version of https://legacy.curseforge.com/minecraft/mc-mods/adaptive-performance-tweaks-mods as separate mod.

⚠️ Please Read Before Using

Mods Optimizer will rename or move files inside your mods folder.
➡️ Make sure to keep regular backups of your modpack and server files.
While the mod includes safety checks, it cannot cover every possible edge case.

👾 Automatic Server Bundle Support

Mods Optimizer automatically disables mods that are client-only or **incompatible with servers **.
You no longer need to maintain separate client and server modpacks!

  • ✅ One modpack works for both client and server
  • 🚫 No more guesswork or duplicate maintenance

🧹 Automatic Mod Cleanup

Tired of cleaning out old versions manually?

Mods Optimizer detects and removes duplicate mod versions during startup.
This helps keep your mods folder clean and prevents version conflicts.

  • 🗑 Removes outdated mod files
  • ✅ Keeps only the latest version

🚀 How to Use the Mod

  1. Add Mods Optimizer to your modpack (client and/or server).
  2. On game or server startup, it will automatically:
    • 🔍 Scan the mods folder
    • 🔄 Classify mods by side (client/server)
    • 🧼 Remove duplicates
    • 🚫 Rename client-only mods on servers to ???.client

Tip: For best results, use this mod on both client and server.

🧵 Fabric Support?

Currently, Fabric is not supported.
Fabric does not allow mods to run after the GameProvider but before the Mod Loader, which prevents Mods Optimizer from functioning correctly.

❗ Support may be added in the future if Fabric changes this behavior.

🧪 Example Modpack

Want to see Mods Optimizer in action?
Check out the BOS Adventure World modpack:
👉 BOS Adventure World on CurseForge

ℹ️ More Information

For full documentation, usage tips, and FAQs:
📖 Visit the Mods Optimizer Wiki

Project description from CurseForge.

Pick your setup

Mods Optimizer by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

39 available setups

Showing the newest 12 of 23 game versions. Older files are in the list below.

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

Mods Optimizer versions and loaders

150 of 150 releases match

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