Lithium Mod (1.21.8, 1.20.1) – Boost Minecraft Performance with Physics & AI Optimizations

If you’re looking for a serious performance boost in Minecraft without altering gameplay mechanics, the Lithium Mod (1.21.8, 1.20.1) is the gold standard. Developed by jellysquid3_, Lithium is a universal optimization mod that targets the game’s core systems including physics, mob AI, chunk loading, redstone logic, and world generation resulting in reduced CPU usage and increased FPS. Compatible with both single-player and multiplayer setups, Lithium offers seamless improvements with no changes to how Minecraft looks or plays. It’s a must-have for high-performance modpacks or vanilla+ experiences.

Features:

• Physics optimizations
  Reduces the complexity of entity collision resolution, especially for simple blocks. This significantly improves performance when entities move quickly or in bulk.
• Mob AI optimizations
  Uses an event-driven system instead of constant world polling, allowing mobs to make decisions faster with much less CPU usage.
• World generation optimizations
  Removes redundant calculations during world generation, speeding up terrain creation without affecting final results.
• Chunk loading optimizations
  Improves data structure efficiency during palette compaction and batching, minimizing TPS drops and improving terrain loading speed.
• Mob farm improvements
  Optimized entity collision checks reduce lag in mob cramming scenarios, making large mob farms far more server-friendly.
• Block ticking optimizations
  Greatly reduces block tick scheduling time from O(n) to O(1), improving the performance of redstone machines and update chains.
• Explosion optimizations
  Enhances the efficiency of TNT and explosion physics by optimizing ray-tracing and position tracking keeping them visually unchanged while reducing lag.
• Point of Interest (POI) improvements
  Speeds up villager and pillager AI tasks by switching from slow stream-based queries to fast iterators, yielding a 16–22x performance gain in POI searches.
• Entity data tracking improvements
  Uses flat arrays and reduces thread locking to accelerate access to entity states and attributes on every tick.
• Highly configurable
  Includes a config file that lets you disable individual optimization categories for compatibility with other mods.
• Universal support
  Works in both client and server environments, compatible with Fabric, NeoForge, and Quilt.

Requires:

Minecraft Forge

Fabric API

Fabric Modloader

How to install:

How To Download & Install Mods with Minecraft Forge

How To Download & Install Fabric Mods

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Why use Lithium Mod?

Unlike most performance mods that only tweak graphics or reduce render distance, Lithium dives deep into Minecraft’s backend code to unlock serious speed improvements across the board. Whether you’re running a redstone-heavy survival world, a bustling multiplayer server, or a mega-modpack, Lithium reduces tick lag, chunk stutters, and unnecessary CPU waste.

Best of all, it requires no in-game setup just drop it in your mods folder and enjoy the speedup. It works silently in the background, ensuring your Minecraft world runs smoother, faster, and more efficiently.