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.
Quick answer
Which Mods Optimizer release should I use?
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.
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.
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.
- 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.
- 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.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 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?

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
- Add Mods Optimizer to your modpack (client and/or server).
- On game or server startup, it will automatically:
- 🔍 Scan the
modsfolder - 🔄 Classify mods by side (client/server)
- 🧼 Remove duplicates
- 🚫 Rename client-only mods on servers to
???.client
- 🔍 Scan the
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.
1.21.10
2 loader builds1.21.9
2 loader builds1.21.8
2 loader builds1.21.7
2 loader builds1.21.6
2 loader builds1.21.5
2 loader builds1.21.4
2 loader builds1.21.3
2 loader builds1.21.1
2 loader builds1.21
2 loader builds1.20.6
2 loader buildsShowing 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
mods_optimizer-forge-1.21.11-4.3.0.jar
7 Jun 2026
mods_optimizer-neoforge-1.21.11-4.3.0.jar
7 Jun 2026
4.3.0
mods_optimizer-forge-1.21.11-4.3.0.jar
7 Jun 2026
4.3.0
mods_optimizer-neoforge-1.21.11-4.3.0.jar
7 Jun 2026
mods_optimizer-neoforge-1.21.10-4.3.0.jar
13 Dec 2025
mods_optimizer-forge-1.21.10-4.3.0.jar
13 Dec 2025
4.3.0
mods_optimizer-neoforge-1.21.10-4.3.0.jar
13 Dec 2025
4.3.0
mods_optimizer-forge-1.21.10-4.3.0.jar
13 Dec 2025
mods_optimizer-neoforge-1.21.9-4.3.0.jar
13 Dec 2025
mods_optimizer-forge-1.21.9-4.3.0.jar
13 Dec 2025
4.3.0
mods_optimizer-neoforge-1.21.9-4.3.0.jar
13 Dec 2025
4.3.0
mods_optimizer-forge-1.21.9-4.3.0.jar
13 Dec 2025
Looking for an older file? The official CurseForge project page is in Resources.