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Lithium (Fabric/NeoForge)

Mod

by JellySquid

An optimization mod for Minecraft which improves server performance significantly.

Type

Mod

CurseForge Downloads

101,999,118

CurseForge ID

360438

Modrinth Downloads

141,303,196

Modrinth ID

gvQqBUqZ

Last Updated

Nov 6, 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 (3,805)

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Fabulously Optimized Fabulously Optimized Cobblemon Official Modpack [Fabric] Cobblemon Official Modpack [Fabric] Prominence™ II: Hasturian Era Prominence™ II: Hasturian Era Better MC [FABRIC] BMC1 Better MC [FABRIC] BMC1 COBBLEVERSE - Pokemon Adventure [Cobblemon] COBBLEVERSE - Pokemon Adventure [Cobblemon] Better MC [FABRIC] BMC2 Better MC [FABRIC] BMC2 Immersed With Shaders Immersed With Shaders Medieval MC [FABRIC] MMC1 Medieval MC [FABRIC] MMC1 DarkRPG - RPG with Magic, Origins, Quests, Adventure DarkRPG - RPG with Magic, Origins, Quests, Adventure All the Mods 10: To the Sky ATM10SKY All the Mods 10: To the Sky ATM10SKY Better MC [NEOFORGE] BMC5 Better MC [NEOFORGE] BMC5 Homestead - A Cozy Survival Experience Homestead - A Cozy Survival Experience Sodium Plus Sodium Plus Vanilla Perfected Vanilla Perfected BigChadGuys Plus (w/ Cobblemon!) BigChadGuys Plus (w/ Cobblemon!) Lucky Block Challenge Lucky Block Challenge OptiFabriс OptiFabriс Prominence™ II: Hasturian Era Prominence™ II: Hasturian Era Better Adventures+ Better Adventures+ SkyBlock Enhanced SkyBlock Enhanced Dungeon Heroes (RPG Series) Dungeon Heroes (RPG Series) Fantasy MC Fabric Fantasy MC Fabric Better MC [FABRIC] BMC3 Better MC [FABRIC] BMC3 All of Create All of Create Valhelsia: Enhanced Vanilla Valhelsia: Enhanced Vanilla Cobblemon Delta Cobblemon Delta Distant Horizons & Iris Shaders Distant Horizons & Iris Shaders Cobblemon Official Modpack [NeoForge] Cobblemon Official Modpack [NeoForge] Fresh & Smooth Fresh & Smooth Aged Aged Remarkably Optimized Remarkably Optimized Create+ Create+ Create: Astral Create: Astral Create Live 4 Create Live 4 红石生电优化【Redstone Survival Optimization】 红石生电优化【Redstone Survival Optimization】 Pokemon Elysium Pokemon Elysium Cobblemon - Mega Pokemon in Cobblemon + Trainer Gyms + Cobblemon with Friends + Cobblemon MMO RPG for Cobblemon Realms Cobblemon - Mega Pokemon in Cobblemon + Trainer Gyms + Cobblemon with Friends + Cobblemon MMO RPG for Cobblemon Realms Skyblocker Collections Skyblocker Collections ArdaCraft ArdaCraft All of Fabric 3 - AOF3 All of Fabric 3 - AOF3 Hoplite for Lunar Client Hoplite for Lunar Client Landscapes Reimagined Genesis Landscapes Reimagined Genesis Cobblemon Updated - Includes Every Pokemon! Cobblemon Updated - Includes Every Pokemon! New Game - An Improved Experience | 1.21 UPDATE! New Game - An Improved Experience | 1.21 UPDATE! RealisticCraft RealisticCraft All of Create - Aeronautics All of Create - Aeronautics Keo optimized Keo optimized Homestead Homestead BigChadGuys and the Holy Grail BigChadGuys and the Holy Grail Better OneBlock Better OneBlock Spunky Boost Spunky Boost Breakneck: Optimized | FPS Boost, Shaders & QoL Breakneck: Optimized | FPS Boost, Shaders & QoL OptiFine for Fabric OptiFine for Fabric Optimized fps Optimized fps All of Fabric 6 - AOF6 All of Fabric 6 - AOF6 Servidor Jornadas Cobblemon Servidor Jornadas Cobblemon All of Fabric 5 - AOF5 All of Fabric 5 - AOF5 All of Fabric 7 - AOF7 All of Fabric 7 - AOF7 Amazing Xray Amazing Xray Another Quality Modpack 2 - AQM2 Another Quality Modpack 2 - AQM2 Re-Console+ Re-Console+ More FPS [FORGE] - Increase FPS & Shaders (1.21 UPDATE) More FPS [FORGE] - Increase FPS & Shaders (1.21 UPDATE) Wynncraft for Lunar Client Wynncraft for Lunar Client Essentials Mods [FORGE] - 1.21 RELEASE! Essentials Mods [FORGE] - 1.21 RELEASE! Pokemania Cobblemon Pokemania Cobblemon Spunky Optimized Spunky Optimized 月亮工厂MCF 【Moon Create factory】 月亮工厂MCF 【Moon Create factory】 MCC Island for Lunar Client MCC Island for Lunar Client Wynncraft Plus Wynncraft Plus Performium Performium Techopolis 3 Techopolis 3 XPlus PerioTable Modpack (Fabric) XPlus PerioTable Modpack (Fabric) New Simple Mods - Easy to Understand | 1.21 UPDATE! New Simple Mods - Easy to Understand | 1.21 UPDATE! Optimization Optimization uku's pvp modpack uku's pvp modpack StaTech Industry StaTech Industry Low Res Trailer Recreation Low Res Trailer Recreation More Animals [FORGE] - 1.21 UPDATE! More Animals [FORGE] - 1.21 UPDATE! Rapid Optimization Rapid Optimization TownCraft TownCraft Additive Additive MAX FPS: Optimized MAX FPS: Optimized Optimized fps [(NEO)FORGE] Optimized fps [(NEO)FORGE] The Cobblemon SMP - Pokemon in Minecraft The Cobblemon SMP - Pokemon in Minecraft Hypixel Skyblock for Lunar Client Hypixel Skyblock for Lunar Client Elysium Days Elysium Days Medieval MC [FABRIC] MMC3 Medieval MC [FABRIC] MMC3 Tensura Neo Otherworld Tensura Neo Otherworld 命运齿轮FOM【Fate's Machinery】 命运齿轮FOM【Fate's Machinery】 Pixelmon Jenny Pixelmon Jenny Adrenaline Adrenaline MineField Mods MineField Mods All of Fabric 4 - AOF4 All of Fabric 4 - AOF4 Conquest Reforged Modpack (Fabric) Conquest Reforged Modpack (Fabric) Cobblemon.gg - Ultimate Pokemon Experience Cobblemon.gg - Ultimate Pokemon Experience NotiFine NotiFine Pixelmon Plus+ The Top Pokemon Experience in Pixelmon - Fully Optimized - Best Pixelmon Server - All Pokemon Pixelmon Plus+ The Top Pokemon Experience in Pixelmon - Fully Optimized - Best Pixelmon Server - All Pokemon CobbleGalaxy - Cobblemon CobbleGalaxy - Cobblemon Actions & Better [ON JAVA] Actions & Better [ON JAVA] Conquest Reforged Modpack (Fabric) Conquest Reforged Modpack (Fabric)

External Resources

CurseForge Modrinth Source Code Issues