Mod - Modrinth
Lithium
No-compromises game logic optimization mod, useful for both single-player games and multi-player servers.
Source-provided project description. FreeMinecraftMods keeps creator credit and adds separate compatibility and decision guidance below.
Project overview
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](https://www.speedrun.com/mc). ## 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](https://modrinth.com/mod/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](https://github.com/CaffeineMC/lithium-fabric/wiki/Configuration-File) 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.
FreeMinecraftMods decision guide
This mod is most relevant to players looking for optimization on fabric, neoforge, quilt. Treat those labels as discovery hints, then verify the exact file and dependency list on the official project page.
The source record was updated on Jul 10, 2026, which is a recent freshness signal. A recent date does not guarantee support for every loader or Minecraft version, so still inspect the current file list.
What to verify before choosing a file
- Confirm that the file is published by the credited creator on the linked official source.
- Match the Minecraft version exactly instead of relying only on a broad category label.
- Read dependencies, incompatibilities, and changelog notes before updating an existing instance.
- Match the loader or server platform and its required version. Forge and NeoForge are not interchangeable.
- Back up worlds and configuration files before testing the project in a long-term save or public server.
Compatibility at a glance
Minecraft versions in this snapshot: 1.20.3, 1.20.4, 1.20.5, 1.20.6, 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7
Loaders and platforms: fabric, neoforge, quilt
Before you install
Match the exact Minecraft version and loader, install every required dependency, and test in a separate profile before opening an important world. Keep a backup before changing a working mod list.
Source, licensing, and corrections
FreeMinecraftMods does not mirror the project files. Use the official source for downloads, release notes, dependencies, support, and licensing details. Project names, images, and creator-written descriptions remain the property of their respective owners.
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