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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

102,081,804

CurseForge ID

360438

Modrinth Downloads

141,522,378

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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More Realistic [FABRIC] - 1.21 UPDATE! Cobblemon Jenny Cobblemon Jenny ElysiumCraft Rp ElysiumCraft Rp Fiyrthgu's Hypixel Skyblock Modpack Fiyrthgu's Hypixel Skyblock Modpack Ultra Hardcore Renewed - Do you dare to play it? | 1.21 UPDATE! Ultra Hardcore Renewed - Do you dare to play it? | 1.21 UPDATE! Random Item Skyblock - Planomania I Random Item Skyblock - Planomania I New Game 3 - Immersive RPG Adventures & RPG Quests New Game 3 - Immersive RPG Adventures & RPG Quests Nizco's Cobblemon Horizons Nizco's Cobblemon Horizons Remade And Remastered Remade And Remastered Immersive Experience - Inspired by Actions & Stuff and Other Immersive Mods Immersive Experience - Inspired by Actions & Stuff and Other Immersive Mods Fps+ BOOST FPS Fps+ BOOST FPS Thumbnailing Thumbnailing Create: Think Bigger! V2.4 Create: Think Bigger! V2.4 Steve5's Origins Plus Pack Steve5's Origins Plus Pack Fabric Boosted Fabric Boosted PvP mods with optimization PvP mods with optimization Furniture & Tech Furniture & Tech Boosted FPS (Performance Optimized) (NF) Boosted FPS (Performance Optimized) (NF) Nizco's Cobblemon Adventures Nizco's Cobblemon Adventures Atzlk's PMW Atzlk's PMW Hermitcraft Server Pack Hermitcraft Server Pack Hammer Hammer Xisuma's Hermitcraft Enhancements Xisuma's Hermitcraft Enhancements BetterFPS BetterFPS More Animals 2 - Exclusive Edition with Animals Quests! More Animals 2 - Exclusive Edition with Animals Quests! Vanilla Reimagined Vanilla Reimagined Exodus (Space Mission) | Stellaris & SPACE QUESTS! Exodus (Space Mission) | Stellaris & SPACE QUESTS! Extreme Optimization! Extreme Optimization! Create - Above the Horizon Create - Above the Horizon Better Shaders Better Shaders OptimizationHyperN OptimizationHyperN Newt+ (Sodium Edition) Newt+ (Sodium Edition) Nvidium Performance (Full) Nvidium Performance (Full) SimplyFine SimplyFine RLFabric RLFabric Wynncraft Plus [LITE] Wynncraft Plus [LITE] Easy Optimized Easy Optimized Vulkanite Vulkanite Wynnic Enchantments Wynnic Enchantments Ryan Cliffords VR Expirence 2! Ryan Cliffords VR Expirence 2! Waddon1's Performance Modpack 26.1 Waddon1's Performance Modpack 26.1 Quantum Freedom 3 Quantum Freedom 3 CastCrafter CA14 Mische CastCrafter CA14 Mische Progress: Create Progress: Create [UO]Ultramodern optimization [UO]Ultramodern optimization Star Wars: Galaxy Wars Star Wars: Galaxy Wars SharedLife - New Multiplayer Experience! SharedLife - New Multiplayer Experience! MineColonies - Cobblemon Conquest MineColonies - Cobblemon Conquest TalonMC Cobblemon TalonMC Cobblemon Take A Look GUNS Take A Look GUNS LunarFox LunarFox Void's essentially optimized pack Void's essentially optimized pack More Decorations 2 - Exclusive Edition | Decoration Mods! More Decorations 2 - Exclusive Edition | Decoration Mods! Exosphere 2 + Create (Aeronautics) Exosphere 2 + Create (Aeronautics) S3eed Experience S3eed Experience Sky Frogs Sky Frogs CobbleCreate. The Cobblemon and Create combination! CobbleCreate. The Cobblemon and Create combination! 红石生电极速版【Redstone speed version】 红石生电极速版【Redstone speed version】 Create Expansion - Bigger Create+ | 6.0 UPDATE! Create Expansion - Bigger Create+ | 6.0 UPDATE! Plants vs. Zombies+ | With Plants vs Zombies & More! Plants vs. Zombies+ | With Plants vs Zombies & More! RealCraft RealCraft OneClient (SkyBlock) OneClient (SkyBlock) Cobblemon Dystoria Cobblemon Dystoria Reach For The Skies - A Create Experience! Reach For The Skies - A Create Experience! Keo vanilla Keo vanilla pvp fps modpack keystrokes game pvp fps modpack keystrokes game Cosmic Frontiers Cosmic Frontiers Brassworks SMP modpack Brassworks SMP modpack Cobblemon Optimised Cobblemon Optimised Create Combined Create Combined Ultimate Fps ModPack Ultimate Fps ModPack Forget Me Not Forget Me Not BM - Exosphere 2 Lite BM - Exosphere 2 Lite PVP Pack The Zombie Conquest The Zombie Conquest

External Resources

CurseForge Modrinth Source Code Issues