Lithium Mod Guide: Boost Minecraft Server Performance (2026)
Lithium is a Fabric mod that optimizes Minecraft's internal game logic. It does not change any gameplay. It makes the existing code run faster. Mob AI processes quicker. Block ticking is more efficient. Chunk loading improves. Your TPS stays at 20.
What Lithium Optimizes
- Mob AI pathfinding: Reduces the CPU cost of mob movement calculations
- Block tick scheduling: More efficient processing of random block ticks
- Chunk loading and unloading: Faster serialization and deserialization
- Entity collision detection: Optimized hit detection between entities
- World generation: Faster terrain generation for new chunks
- Hopper mechanics: Reduces unnecessary item transfer checks
Installation
- Install Fabric Loader on your server
- Download Lithium from Modrinth
- Place the jar in your server's
mods/folder - Restart the server
Lithium works on both client and server. For servers, install it server-side and all players benefit automatically.
Performance Impact
Lithium typically reduces MSPT (milliseconds per tick) by 20% to 40%. On a server running at 48 MSPT (dangerously close to lag), Lithium can bring it down to 30 to 35 MSPT.
This means more headroom for players, mobs, and automation before lag starts.
Compatibility
Lithium works alongside:
- Sodium (client-side rendering)
- Krypton (network optimization)
- FerriteCore (memory reduction)
- ModernFix (general fixes)
- Most Fabric mods
It does not work with Forge or Spigot/Paper. Paper has its own built-in optimizations that overlap with what Lithium does.
Lithium vs Paper Optimizations
Paper includes many optimizations inspired by Lithium. If you run Paper, you already get similar benefits. Lithium is for Fabric servers specifically.
| Feature | Lithium (Fabric) | Paper | |---------|-----------------|-------| | Mob AI optimization | Yes | Yes | | Chunk optimization | Yes | Yes | | Hopper optimization | Yes | Yes | | Block tick optimization | Yes | Partial | | Mod support | Fabric mods | Plugins only |
The Bottom Line
If you run a Fabric server, Lithium is mandatory. It is free performance with zero configuration needed. Drop it in the mods folder and your server runs better.
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