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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

102,100,674

CurseForge ID

360438

Modrinth Downloads

141,558,030

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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Ekaii Plus Ekaii Plus FPSCore FPSCore Create SMP Turkiye Create SMP Turkiye Tarrincraft [Create x Cobblemon] Tarrincraft [Create x Cobblemon] Farmer Academy Farmer Academy Simply Optimized 2 Simply Optimized 2 Cobblemoncolonies Cobblemoncolonies VIP (Performance Preset) VIP (Performance Preset) AgalarMC Create AgalarMC Create Tuned Tuned Sorcerer Sorcerer All The Clients All The Clients MarchewkaSMP MarchewkaSMP ftehe's Vanilla+ ftehe's Vanilla+ Vanilla Core Vanilla Core AOR | All of the Random AOR | All of the Random Cobblemon - CobbleTowny Cobblemon - CobbleTowny ChaMods ChaMods Create - Brand New World Create - Brand New World KeeKee's SMP Visual KeeKee's SMP Visual Opal Opal ItzBuble's Create ItzBuble's Create Pervenience Pervenience Vivid Motions Vivid Motions GGPlays Cobblemon GGPlays Cobblemon Create: Physics And Aeronautics [Server-Side] Create: Physics And Aeronautics [Server-Side] Blood on the Clocktower Blood on the Clocktower LeafiumBoost LeafiumBoost LynhanSMP Modpack LynhanSMP Modpack Tropical Paradise Tropical Paradise Leos fantastiska modpaket Leos fantastiska modpaket Crazy Craft Server Modpack Crazy Craft Server Modpack OPLAZEY OPLAZEY BagelSMP optimizer BagelSMP optimizer Creatively Create Tales of Horizon Tales of Horizon spears spears Butter Minecraft Butter Minecraft ELEV8 ELEV8 Hydra Studio opti-Modpack Hydra Studio opti-Modpack FlatWorlds FlatWorlds KillFPS+ KillFPS+ EverUncomplete EverUncomplete NasheyPvP NasheyPvP Bloom & Beyond Bloom & Beyond 💎 Legend Infinity Project 💎 Legend Infinity Project Cesura Cesura Martinj Realistico Martinj Realistico Aetherseekers Aetherseekers Vanilla Revamped Vanilla Revamped Cobble Quest Cobble Quest CobbleLegends CobbleLegends Emporia [Server Pack] Emporia [Server Pack] Azeris Azeris Semarina Semarina Wild Odyssey Wild Odyssey Medieval Fantasy For A Reason Medieval Fantasy For A Reason Onyx Onyx Create and Chill Create and Chill Cobbled RPG Cobbled RPG The House Diablo Cobblemon Experience The House Diablo Cobblemon Experience Vulkanoid Vulkanoid Time To Work Time To Work AeronauticsCiC AeronauticsCiC Clarity Clarity Create - The Adventurer Create - The Adventurer Lite Optimizations Lite Optimizations Abyss Server Pack Abyss Server Pack MineCrew-Extra MineCrew-Extra That Time I Got 999+ FPS That Time I Got 999+ FPS Tekwiz Tekwiz HurleyCraft HurleyCraft Craft Colonies Craft Colonies Renderium Optimized Renderium Optimized Mundo Mitico Mundo Mitico Troll Physics Server Pack Troll Physics Server Pack Vanilla Seasoning Vanilla Seasoning Blue Moon SMP Blue Moon SMP Remboy optimized Neo Remboy optimized Neo Gorgeous Optimizations Gorgeous Optimizations Vanilla with Benefits Vanilla with Benefits Cherry+ Cherry+ Village Witch Village Witch Astryx Astryx Create: War and Economy Create: War and Economy Simply Optimized Rebirth Simply Optimized Rebirth Stahl und Sterne Stahl und Sterne Musa's Fantasy Craft Musa's Fantasy Craft Build n' Bake Build n' Bake OXG Modpack Client OXG Modpack Client Minevui Optimized Minevui Optimized Infinity Craft Infinity Craft Creative FPS+ Creative FPS+ SE Aeroworks SE Aeroworks Cobblemon Netherite Cobblemon Netherite OptimisticMC PvP OptimisticMC PvP LotaCraft: Lotaria LotaCraft: Lotaria Simply Create SMP Simply Create SMP The Core Modpack The Core Modpack OptiCore OptiCore

External Resources

CurseForge Modrinth Source Code Issues