CurseForge · Minecraft mod

LagLess: Server Optimizer

A server-side utility mod designed to optimize performance and manage RAM efficiently through smart automated cleanups and manual commands.

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Quick answer

Which LagLess: Server Optimizer release should I use?

Updated 3 months ago

Latest stable file LagLess: Servers-1.0.0.jar

Game version 1.20.1

Loader Forge

LagLess: Server Optimizer LagLess: Servers-1.0.0.jar targets 1.20.1 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 LagLess: Server 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.

Understand client and server requirements Read the Minecraft installation guide

What else does LagLess: Server Optimizer LagLess: Servers-1.0.0.jar need?

LagLess: Servers-1.0.0.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 LagLess: Server Optimizer without breaking your instance.

Built for LagLess: Server Optimizer LagLess: Servers-1.0.0.jar. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use LagLess: Servers-1.0.0.jar. It targets 1.20.1 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 LagLess: Servers-1.0.0.jar. It opens that exact file at the source.

About this project

What does LagLess: Server Optimizer add?

🚀 Lagless: Servers
Lagless: Servers is a lightweight, high-efficiency utility mod designed to optimize RAM usage and keep your Minecraft 1.20.1 server running smoothly. By intelligently monitoring memory consumption, it helps prevent lag spikes and crashes caused by memory exhaustion.

🌟 Key Features
Smart Automated Cleanup: The mod periodically checks your server's RAM usage. If it exceeds a predefined threshold, it automatically frees up memory and clears unneeded temporary objects.

Server-Side First: You only need to install this mod on your server. Players do not need to have it installed on their clients to join! (Note: It can also be used in single-player for local optimization).

Zero Lag Impact: The verification system is designed to be lightweight, running seamlessly in the background without freezing the main server thread.

📊 Performance Benchmarks:

During local server tests (IntelliJ IDEA environment), the mod achieved a memory reduction of 366MB (6%). In other heavier scenarios, the cleanup process successfully freed up to 14% of the total RAM in use.

⚙️ Commands
/forcecleanup

Manually forces an immediate memory cleanup.

Displays exactly how much RAM was freed, along with the "Before" and "After" usage stats.

🔧 Configuration
The mod generates a lagless-server.toml file in your config folder, allowing you to fully customize its behavior:

autoCleanup (Default: true): Enable or disable the automatic memory management system.

cleanupInterval (Default: 300): How often (in seconds) the mod checks the RAM usage.

memoryThreshold (Default: 80): The RAM usage percentage that will trigger the automatic cleanup.

💡 Need a Client-Side mod? If you are looking for local FPS improvements instead of server management, I recommend using:

Lagless: FPS Optimizer

📦 Installation
Download the latest .jar file for Minecraft 1.20.1.

Drop it into your server's mods folder.

Start the server and enjoy a lag-free experience!

Project description from CurseForge.

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