Lithium (Fabric/NeoForge)

Source-provided project description. FreeMinecraftMods keeps creator credit and adds separate compatibility and decision guidance below.

Project overview

Want to help support development? Lithium is made possible thanks to the awesome supporters. Each pledge allows us to spend more time working on mods like these while helping to cover a few expenses. And special thanks to everyone else who helped with the development of Lithium. If you're a programmer who would like to contribute to the project, consider taking a look at our open issues for ideas on how you can help. You can join our discord community with support and discussion channels: Lithium (for Fabric Loader) Lithium is a general-purpose optimization mod for Minecraft, which works to improve a number of systems (game physics, mob AI, block ticking, etc) without changing any behavior. It works on both the client and server , and can be installed on servers without requiring clients to also have the mod . With the mod installed, you can expect to see more than a 50% improvement to tick times, resulting in a much faster game. Even in single-player, your game runs an "integrated server" which ticks the world your player is in. Through optimizing the "server side" of the game, this can free up your computer's processor to focus on other tasks (i.e. rendering), resulting in improved frame rates and responsiveness . For multiplayer servers, administrators can expect a sizeable improvement to tick times, allowing their hardware to support more loaded entities, chunks, and players. If you aren't using it already as well, Phosphor and Sodium both pair great with Lithium and are fully compatible. 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. Features You might be curious by now as to what exactly Lithium is doing in order to achieve such significant gains, and I'm happy you are! You can read about (some) of the changes we make in the spoiler below. Physics optimizations: Entity collision detection has seen significant improvements through reducing the collision resolution complexity for simple, cuboid blocks. A more accurate algorithm is also used to reduce the number of blocks being checked every tick, especially in cases where entities are moving very quickly. Mob AI optimizations: We make use of an event-based system for some tasks in order to reduce the CPU usage incurred by constantly polling the world for changes. Mob "brains" have also been optimized to select between different AI tasks much, much quicker than before. Comparison before and after here . World generation optimizations: Many calculations in vanilla's world generation are unnecessary and do not affect the final result, which gives ample opportunity for Lithium to optimize this overhead away. Chunk loading optimizations: The temporary data structures used in block palette compaction have been changed to be much more efficient. This results in fewer TPS drops while players are exploring terrain and provides a modest boost to world load times. We also batch some verification operations to reduce unnecessary disk I/O. Mob farm optimizations: Mob cramming is significantly less expensive as resolving collisions between entities has been optimized to take advantage of the fact that simple boxes are involved. This makes mob farms considerably less harmful for server tick rates. Block ticking optimizations: has less overhead, making things such as block update settling after generating chunks and other Redstone contraptions faster. This also reduces the amount of time it takes for a block to determine if it is ticking by schedule from O(n), where n is the number of ticking blocks, to O(1), providing a significant speedup when many blocks are being ticked. Explosion optimizations: Many optimizations have been applied to TNT and explosions alike, reducing their associated lag without changing how they behave. In particular, ray-tracing is optimized to take advantage of the fact that multiple steps through a way will occur in the same block position, allowing us to quickly re-use the previous step's results. We also make use of a faster position tracking algorithm which avoids many excessive allocations. Point of Interest optimizations: Complex mob AIs in Minecraft, primarily those belonging to Villagers and Pillagers, often need to find relevant points of interest in the world in order to choose the most appropriate AI task. In vanilla, querying all points within a chunk requires 16 separate retrievals through stream-heavy code. With Lithium present, this task is reduced to a single simple retrieval that makes use of a much faster (and traditional) iterator based approach, yielding anywhere from a 16-22x improvement for queries. Data Tracker optimizations: The internal data manager used for tracking some entity state and properties has been optimized to use flat arrays and avoid expensive locking, providing a decent boost whenever these attributes are accessed during a game tick. Redstone Wire optimizations : Calculating the new power level of redstone wire after a block update is costly. Reducing the number of blockstate ch

FreeMinecraftMods decision guide

This mod is most relevant to players looking for Performance on NeoForge, Fabric, 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: 1.20.4, 1.20.3, 1.20.2, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.18.2, 1.19.1, 1.19, 1.18.1, 1.18

Loaders and platforms: NeoForge, Fabric, 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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