Beyond Paper: Why LeafMC is the Ultimate Performance Jar

A deep dive into LeafMC, the high-performance Minecraft server jar designed for modern scaling.

Reading time: 2 min read

Beyond Paper: Why LeafMC is the Ultimate Performance Jar

For years, PaperMC has been the gold standard for Minecraft server performance. However, as servers grow larger and versions become more demanding, forks like LeafMC have emerged to push the boundaries even further.

What is LeafMC?

LeafMC is a high-performance fork of Paper and Purpur, specifically designed for large-scale networks and SMPs. It integrates advanced performance patches from various sources (including Pufferfish and Gale) while adding its own unique optimizations.

Key Performance Features

1. Multithreading Patches

Standard Minecraft is notoriously single-threaded. LeafMC implements several "async" patches that offload heavy tasks (like pathfinding, entity tracking, and hopper checks) to separate CPU threads. This prevents the main "tick" loop from hanging, keeping your TPS stable at 20.0.

2. Map Collision Optimization

Entity collisions are one of the biggest causes of lag in large mob farms or crowded hubs. LeafMC optimizes how the server calculates these collisions, allowing for thousands of entities to coexist with minimal impact on MSPT.

3. Region File Improvements

Loading and saving chunks can cause "io-wait" lag. LeafMC includes optimizations for the way region files are handled, making chunk loading smoother, especially on servers without high-end NVMe storage.

Should You Switch?

If you are running a small server with 5-10 friends, Paper or Purpur is likely enough. However, if you are:

• Running an SMP with 50+ concurrent players.
• Hosting a competitive Factions or Prison server.
• Experiencing frequent TPS drops despite having good hardware.

Then LeafMC is a highly recommended upgrade. It is a "drop-in" replacement, meaning you can just swap your paper.jar with leaf.jar and it will work with your existing worlds and plugins.

Conclusion

Performance isn't just about hardware; it's about the software efficiency. LeafMC provides the optimizations needed to make the most of your CPU, ensuring a lag-free experience for your community.