Lithium for Forge

An unofficial Forge port of Lithium by CaffeineMC.

Original project: https://github.com/CaffeineMC/lithium Original on CurseForge: https://www.curseforge.com/minecraft/mc-mods/lithium

Lithium optimises a broad set of the game's internal systems - physics, mob AI, block ticking, chunk loading and world generation - without changing vanilla behaviour. It is safe in multiplayer and on servers, and it complements Sodium, which optimises rendering instead.

This build targets MinecraftForge 26.2, which upstream does not currently support.

Requirements

Minecraft 26.2 with MinecraftForge 65 or later, running on Java 25. Works on both the client and a dedicated server; no other mod is required.

How this differs from the original

Three optimisations are disabled in this build. They rely on mixin mechanics that only the Fabric loader provides, and which Forge's build of SpongePowered Mixin does not; rather than reimplement them and risk subtly wrong behaviour in world generation and entity ticking, they are switched off. Everything else is upstream behaviour, unchanged.

Apart from those three, the only changes are to the loader-specific glue: the mod entry point, the mod metadata, and the mixin compatibility level, which is lowered to the highest value that the Mixin build shipped with Forge recognises. That last one affects only which bytecode is permitted inside mixin classes, not the bytecode that is produced.

Credit and licence

All credit for this mod goes to CaffeineMC. This is not an official build and is not endorsed by the original authors - please report issues here rather than to them.

Distributed under the GNU Lesser General Public License v3, the same licence as the original project, whose licence text is included in the jar. In keeping with that licence, the modified sources for this port are available to anyone who asks for them.