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.