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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

102,104,622

CurseForge ID

360438

Modrinth Downloads

141,582,530

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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MerVik’s Vanilla+ MerVik’s Vanilla+ Glatzencraft Glatzencraft Echoes of Alpha: The Herobrine Myth Echoes of Alpha: The Herobrine Myth Refined Refined HDR+ HDR+ MC23s Modpack MC23s Modpack SupernovaSMP SupernovaSMP GenPlus GenPlus The Foundry Pack The Foundry Pack Wolf's Enhanced Vanilla Wolf's Enhanced Vanilla DDAGCraft DDAGCraft Electronium Refined Electronium Refined Artiz simple modpack Artiz simple modpack Minimal Boating Minimal Boating MrOptimizer: Legend Edition MrOptimizer: Legend Edition Simply Optimized But Better Simply Optimized But Better Sven's Venture Sven's Venture SunsetCat's Create Modpack Balanced Origins Balanced Origins MilkyGang Adventure+ MilkyGang Adventure+ CityKingFPS CityKingFPS Create Aeronautics++ Create Aeronautics++ MDSMP Refresh MDSMP Refresh CreatorCraft 2 CreatorCraft 2 EquinoxxMC EquinoxxMC Killercode's SMP Killercode's SMP CPWN Pack 2 CPWN Pack 2 EchoShift Ultimate EchoShift Ultimate CookieAttack 5 CookieAttack 5 Cobblemon Chaos Edition Cobblemon Chaos Edition Solrise Solrise Silver Age+ Silver Age+ Suzeren Optimization Suzeren Optimization Modded Hollow Modded Hollow Goosker's Medieval Modpack Goosker's Medieval Modpack Miummy! Miummy! MC Plus MC Plus Simple Optimized Vanilla Simple Optimized Vanilla Void-Attack Void-Attack CaliburnSMP YaLikeFPS? YaLikeFPS? Vanilla Reloaded Vanilla Reloaded Ultimate Client Ultimate Client Cyclo's Gearbound Cyclo's Gearbound Pixel's Simply Reoptimized Pixel's Simply Reoptimized Create : Core Create : Core Visually Vibrant - [FABRIC] Visually Vibrant - [FABRIC] Les petits pédestres Les petits pédestres Jameel's Private SMP Jameel's Private SMP Endless horizon Endless horizon Electrical Warfare Electrical Warfare AdemEXE AdemEXE The optimized script The optimized script glutchy's performance modpack glutchy's performance modpack ElunovaPack ElunovaPack Peace Optimizer Peace Optimizer Performium [expanded] Performium [expanded] DonutSMP Enhanced DonutSMP Enhanced Lab Lite Lab Lite Bosstimized Bosstimized Dungeons & adventures [D&D] Dungeons & adventures [D&D] ZeroFabric ZeroFabric Greveholm Essentials Greveholm Essentials Cogwheels and Wires Cogwheels and Wires Hyblock Hyblock Amethyst Eclipse Amethyst Eclipse Create: Aeronova Create: Aeronova kraizipack kraizipack Vanilla Refined Vanilla Refined Cobblemon ViewerSMP Cobblemon ViewerSMP SiestaSMP Modpack SiestaSMP Modpack RE:mix RE:mix Wayward Wayward Vulkan: X-Lite Vulkan: X-Lite Vanilla Essencia Vanilla Essencia Create - CMY Create - CMY prjkt333 prjkt333 Beyond Vanilla+ Beyond Vanilla+ what the gog doin' what the gog doin' Last MC 2025 JTF Last MC 2025 JTF SimplyCraft SimplyCraft Craft And Chill Craft And Chill Fantastically Optimised (Vulkan) Fantastically Optimised (Vulkan) Cobble Champs Official Cobble Champs Official CraftCore Modpack CraftCore Modpack SuperCraft SuperCraft Lotus Vision Lotus Vision Dragones y Dirigibles Dragones y Dirigibles MercuryFPS MercuryFPS FreizeitparkCraft FreizeitparkCraft VPatchcraft VPatchcraft Bastelgruppen Client Optimized Bastelgruppen Client Optimized Ultimate Hypixel Mining Ultimate Hypixel Mining Refabricated Villagers: Vanilla+ Refabricated Villagers: Vanilla+ Neoclassic Neoclassic Hypixel Modpack P0 Hypixel Modpack P0 Chill&Stay Chill&Stay Bluelight Client Plus Bluelight Client Plus Cobble X Friends Cobble X Friends Venture INC. Venture INC.

External Resources

CurseForge Modrinth Source Code Issues