Lithium Mod: Download and Install Guide (26.3)

Lithium: faster game logic for Minecraft 26.3, without changing vanilla

Lithium optimizes game physics, mob AI and block ticking without changing any vanilla mechanic. What it does in singleplayer and on servers, plus how to install version 0.26.2 on Minecraft 26.3.

October 5, 20261 min readby The Mod Hunter

A voxel-style Minecraft meadow with glowing tick rings around the hunter, next to the title Lithium
Still from The Mod Hunter's Lithium video, rebuilt in a voxel renderer. Not an in-game screenshot.
Lithium for Minecraft 26.3 title card 1:34

The short version

Lithium for Minecraft 26.3

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Sodium makes Minecraft draw faster. Lithium makes it think faster: it optimizes the systems the game runs every tick, without changing a single vanilla mechanic. Version 0.26.2 is out for Minecraft 26.3.

What Lithium does

Lithium is a general-purpose optimization mod by CaffeineMC, the team behind Sodium. It improves a number of systems such as game physics, mob AI and block ticking, with the strict goal of keeping exact vanilla behavior. That’s why it has even been officially allowed in Minecraft speedrunning.

Singleplayer and servers

  • Singleplayer: your game runs an internal server that ticks the world. Lithium optimizes that server, which frees up your processor and can mean better frame rates and a more responsive game.
  • Servers: admins can expect a sizeable improvement to tick times, so the same hardware can handle more loaded entities, chunks and players.
  • One side is enough: Lithium works on a server without players installing it, and on a client without the server having it.

Lithium and Sodium

The two complement each other: Sodium speeds up rendering, Lithium the game logic. Many players run both.

Lithium for Minecraft 26.3

The current release is 0.26.2 for Minecraft 26.3, for Fabric and Quilt and for NeoForge since September 28, 2026. Lithium has more than 130 million downloads on Modrinth.

How to install Lithium

  1. Install your mod loader for Minecraft 26.3: Fabric, Quilt or NeoForge.
  2. Download Lithium for 26.3 from Modrinth, filtered by your loader. It needs no other mods.
  3. Put it into your mods folder (.minecraft/mods for the vanilla launcher, or your instance’s mods folder in Prism, the CurseForge app or the Modrinth App), or into the server’s mods folder.

One tip

If another mod ever clashes with Lithium, you don’t have to remove it: its config file lets you switch off single optimizations.

Three pedestals with a falling block, a fox and a lamp block, a crimson gear above them and a 20 ticks per second ring
Every tick, the game runs physics, mob AI and block updates. Lithium optimizes exactly those systems.
Two identical pedestals labeled Vanilla and With Lithium with the same falling blocks
Vanilla stays vanilla: the same machine behaves exactly the same with Lithium.
A server rack next to glowing chunk tiles with foxes and rabbits, and a time per tick gauge
On servers, better tick times let the same hardware handle more entities, chunks and players. Illustration, not a benchmark.
A config file panel with the line mixin.ai.pathing=false next to the Lithium gear
If another mod clashes, switch off a single optimization in Lithium's config file, for example mixin.ai.pathing=false.

Stills from my Lithium video, rebuilt in a voxel renderer. Not in-game screenshots.

FAQ

Is Lithium available for Minecraft 26.3?

Yes. Version 0.26.2 is a release for Minecraft 26.3 on Fabric and Quilt and on NeoForge (September 28, 2026).

Does Lithium change how the game works?

No. Its strict goal is to keep exact vanilla behavior, which makes it suitable even for highly complex gameplay scenarios and creations. It has even been officially allowed in Minecraft speedrunning.

Does Lithium give me more FPS?

Indirectly. Lithium optimizes the game logic, not the graphics. In singleplayer it makes the internal game server lighter, which frees up your processor and can improve frame rates and responsiveness. For rendering, use Sodium.

Do players need Lithium if the server has it?

No. Lithium can be installed on a server without clients having it, and the other way round.

Does Lithium need Fabric API?

No. The 26.3 versions have no dependencies, just your mod loader.

A mod conflicts with Lithium. What can I do?

Lithium has a configuration file that lets you turn off individual optimizations, so you can disable the one that clashes instead of removing the whole mod. An empty config file is normal and means the defaults are active.

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