CurseForge · Minecraft mod
MCOptimizer
A powerful performance optimization mod that significantly increases FPS and stabilizes gameplay.
Quick answer
Which MCOptimizer release matches 26.3 NeoForge?
mcoptimizer-1.0.6-neoforge-26.3.jar targets 26.3 with NeoForge. 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 MCOptimizer 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 mcoptimizer-1.0.6-neoforge-26.3.jar need?
mcoptimizer-1.0.6-neoforge-26.3.jar on 26.3 NeoForge. Every mod below is checked against that same setup.
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 MCOptimizer without breaking your instance.
Built for mcoptimizer-1.0.6-neoforge-26.3.jar on 26.3 NeoForge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use mcoptimizer-1.0.6-neoforge-26.3.jar. It targets 26.3 with NeoForge; 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 mcoptimizer-1.0.6-neoforge-26.3.jar. It opens that exact file at the source.
About this project
What does MCOptimizer add?
MCOptimizer — Smart Server-Side Lag Mitigation
MCOptimizer is a lightweight yet highly effective server-side utility designed to eliminate the root causes of server lag in Minecraft. Instead of heavy mods that completely rewrite game logic, MCOptimizer selectively and smoothly unburdens the server CPU from the most common lag culprits: excessive item drops, frozen entity AI, stuck projectiles, and cascading fluid updates.
Perfect for both vanilla servers and heavy modpacks featuring complex technical or magical mods.
⚡ Key Features & Modules:
🧹 SmartItemCleaner
Prevents massive TPS drops caused by endless item drops from automated farms or uncollected loot.
- Automatically tracks, merges, and safely clears item groupings to significantly lower entity ticking and rendering overhead.The /ecoperform command can cleanse the world of garbage.
🏹 ArrowLagCleaner
Projectiles shot by skeletons or players that get stuck in blocks continue to tick constantly, dragging down server performance.
- This module scans for stuck arrows, checks their NBT tags, and gently purges them from the world, freeing up vital ticking cycles.
💤 LazyEntityAI
Mobs that are far away from any player shouldn't consume valuable server resources by calculating complex pathfinding routes.
- Dynamically optimizes and throttles the AI behavior of passive and hostile entities based on their distance to the nearest player. Mobs in semi-active chunks will no longer cause TPS spikes!
🌊 FluidStuckOptimizer
Massive water or lava flows, along with glitchy infinite sources, often cause micro-stutters due to continuous block updates.
- Forces cascading fluid updates to "settle" and optimizes ticking states around players, instantly stopping chunk-update-related freezes.
⚙️ Technical Highlights:
- 100% Server-Side: Install this mod only on the server. Players can connect seamlessly without needing to install it on their clients.
- Smart Ticking: Heavy checks and cleanups are hooked into player ticks rather than a rigid, heavy global timer. This ensures a smooth mitigation process without the sudden lag spikes common in old-school cleaners.
- High Compatibility: Works flawlessly alongside other chunk-loading or performance-enhancing mods.
Project description from CurseForge.
Pick your setup
MCOptimizer by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.1.2
1 loader build1.21.1
1 loader build1.20.6
1 loader build1.20.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
MCOptimizer versions and loaders
mcoptimizer-1.0.6-neoforge-26.3.jar
2 Nov 2026
Looking for an older file? The official CurseForge project page is in Resources.