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Lithium (Fabric/NeoForge) logo

Lithium (Fabric/NeoForge)

Mod

by JellySquid

An optimization mod for Minecraft which improves server performance significantly.

Type

Mod

CurseForge Downloads

102,087,186

CurseForge ID

360438

Modrinth Downloads

141,528,159

Modrinth ID

gvQqBUqZ

Last Updated

Nov 7, 2026

Description

Lithium is a modern, general-purpose optimization mod for Minecraft which works to improve a number of systems (game physics, mob AI, block ticking, etc) with the goal of not changing any vanilla mechanics.


The mod works on both the client and server, and can be installed on servers without requiring clients to also have the mod (and vice versa.)


For multiplayer servers, administrators can expect a sizeable improvement to tick times, allowing their hardware to support more loaded entities, chunks, and players. Even in single-player, Lithium helps to improve performance by optimizing the internal game server, which is used for "ticking" the world. This can free up your computer's processor to focus on other tasks, resulting in improved frame rates and increased responsiveness.


The strict goal of maintaining exact behavior with vanilla makes Lithium suitable for almost any Minecraft server running Fabric, even for highly complex gameplay scenarios and creations. In fact, our continued insistence towards not changing vanilla gameplay has even led to the mod being officially allowed in Minecraft speedrunning.


Installation

Make sure you have the latest version of Fabric Loader present and then simply drop the mod into your mods folder. No other mods or additional setup (not even Fabric API!) is required. You do not need to create new worlds in order to take advantage of the mod.


While you're at it, you may want to check out Sodium, which improves rendering performance.


Configuration

Lithium makes use of an semi-unusual configuration system which allows you to enable or completely disable patches the mod applies. This system allows fine-grained control over what code in Minecraft is modified by Lithium, and as such, can be used to completely eliminate bugs or mod incompatibilities introduced by the mod.


For more information, please read the wiki entry on modifying your configuration file.


Please note: An empty configuration file is perfectly normal and just means you want to use the default options, which are already set up out of the box for the best performance the mod can offer.


Reporting Issues

Please use the issue tracker linked at the top of the page to report bugs, crashes, and other issues.

Compatibility

Mod Loaders

Fabric Neoforge Quilt

Game Versions

1.16.2 1.16.3 1.16.4 1.16.5 1.17 1.17.1 1.18 1.18.1 1.18.2 1.19 +28 more

Recommended Gear

Affiliate

Hardware and extras that pair well with this mod.

Mini PC for self-hosting

Mini PC for Self-Hosting

A low-power box that can sit in a cupboard and run a modded server around the clock.

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Included in Modpacks (3,812)

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Everwild Everwild Opti Boost Craft Opti Boost Craft Vanilla Optimised Vanilla Optimised Optimization Enhanced Pack Optimization Enhanced Pack TNT Titans TNT Titans Cobblemon Eclipse Cobblemon Eclipse Immersive Pixelmon Immersive Pixelmon Wynncraft Origin Wynncraft Origin Minecraft: Trailer Edition Minecraft: Trailer Edition 简约生电优化 Simplicity Survival Optimization 简约生电优化 Simplicity Survival Optimization Explorer's Feast | 探索者的盛宴 Explorer's Feast | 探索者的盛宴 JSMP - recreated JSMP - recreated DropVersion - Odyssey [FA] DropVersion - Odyssey [FA] Over the Sea | Underwater Adventures! Over the Sea | Underwater Adventures! Atzlk MC: Official Modpack Atzlk MC: Official Modpack ImagineFun Add-Ons ImagineFun Add-Ons Nybblecraft Nybblecraft Cobblemon CobbleLocke - Nuzlocke Randomlocke Server Cobblemon CobbleLocke - Nuzlocke Randomlocke Server The Server26 Clientside Bundle The Server26 Clientside Bundle Essentials:Create Essentials:Create Neon Neon The Better Vanilla The Better Vanilla Carblock Carblock Modpack for Modern Building Modpack for Modern Building Phantom Phantom Create Echoes of the Great Derailment Create Echoes of the Great Derailment FriendsCraft - Designed for Multiplayer | Vanilla-Friendly FriendsCraft - Designed for Multiplayer | Vanilla-Friendly Dieselpunkery Dieselpunkery Jurassic lost Jurassic lost Play Together | Multiplayer, Shared Life, Inventory & Progression (Multiplayer Experience with Friends) Play Together | Multiplayer, Shared Life, Inventory & Progression (Multiplayer Experience with Friends) Quilt Quilt Tensura Reemerged Tensura Reemerged PonyCraft a New Generation Vanilla PonyCraft a New Generation Vanilla Cobblemon Vulkan Cobblemon Vulkan Actium Actium RealisticMinecraft+ RealisticMinecraft+ Affogato Affogato Ultimate Create Experience - Aeronautics Ultimate Create Experience - Aeronautics VisionSteps VisionSteps STEAMPUNK MC STEAMPUNK MC Heartful Memories Heartful Memories Gambling addiction - Casino+ Pack Gambling addiction - Casino+ Pack Squibbin Hangout Squibbin Hangout DIOSESMC - VEGETTA777 - WILLYREX - SERVER DIOSESMC - VEGETTA777 - WILLYREX - SERVER Stoneworks Immersion Pack (S.I.P) Stoneworks Immersion Pack (S.I.P) Damine Damine Industrial Adventures+ Industrial Adventures+ Helix Modpack Helix Modpack Pietes storm chasing mod pack Pietes storm chasing mod pack Ultra Optimized Ultra Optimized Proximity Optimized Vanilla Proximity Optimized Vanilla Pojav+ Pojav+ Bosses'Rise I Excalibur Bosses'Rise I Excalibur Simply Shader Simply Shader PVP Pro PVP Pro S-Rank Studios Cobblemon S-Rank Studios Cobblemon Hydro Vanilla SMP Mods Hydro Vanilla SMP Mods Xirc's Jcraft Journeys Xirc's Jcraft Journeys Create: Stratus Terra Create: Stratus Terra Dynasty Cobblemon Dynasty Cobblemon Asphalt Asphalt Kota Craft Kota Craft Big Globe Optimized (FABRIC) Big Globe Optimized (FABRIC) All About Horror - Survival Fear & Terror Experience All About Horror - Survival Fear & Terror Experience Christmas Dreams Christmas Dreams AllyCraft AllyCraft Astrion Astrion Zalitherlauncher Boost FPS Zalitherlauncher Boost FPS SurShield Modification SurShield Modification AVE - Amethyst Vanilla Extended AVE - Amethyst Vanilla Extended Mermaid Tropolis Mermaid Tropolis Happy Sandwich Happy Sandwich All About Lucky Block - PvP & Events & RNG Madness All About Lucky Block - PvP & Events & RNG Madness RPG Edition III [Frabric] RPG Edition III [Frabric] Ultimate Optimization Ultimate Optimization L&M Essentials L&M Essentials OptiDroid OptiDroid Izakji's Genesis Pack Izakji's Genesis Pack BadLands [Survie/Semi-RP] BadLands [Survie/Semi-RP] Vanilla Bloom - The Enhanced Vanilla Experience Vanilla Bloom - The Enhanced Vanilla Experience POKEPURAM-SMP POKEPURAM-SMP Danmo Danmo VAMPACK VAMPACK The Panda Foundry The Panda Foundry Fully Optimized 2 (Built in Shaders) Fully Optimized 2 (Built in Shaders) The Rise of Newstone Hollow The Rise of Newstone Hollow Vulkan Plus QoL Vulkan Plus QoL RE:Rotaria RE:Rotaria NecoPack NecoPack Decently Optimized Decently Optimized Cobblemon Origins Cobblemon Origins orifu's modpack orifu's modpack Aeroworks Aeroworks shader and optimize shader and optimize Java+ Java+ Speedrunners Speedrunners BGM BGM SMARTCRAFT SMARTCRAFT Distant Horizons – Enhanced Edition | Server | ExoTeam Distant Horizons – Enhanced Edition | Server | ExoTeam All of Dungeons and Taverns All of Dungeons and Taverns

External Resources

CurseForge Modrinth Source Code Issues