Lon is a lightweight performance mod designed for low-end PCs. It tackles lag through smart chunk pre-generation, real-time server monitoring, and automatic memory management.
Key Features:
/pregen <radius> — Pre-generate chunks ahead of time to eliminate exploration lag. The generation runs safely on the server thread with batch processing to prevent strain.
/lon tps — Check server TPS with colour-coded feedback:
🟢 Green (≥19.0): Smooth
🟡 Yellow (≥15.0): Moderate load
🔴 Red (<15.0): Heavy lag
/lon memory — View current memory usage, total allocated, and maximum heap.
/lon memory gc — Manually trigger garbage collection and see exactly how much memory was freed.
Auto GC — Automatically triggers garbage collection when memory usage exceeds 80%, with a built-in cooldown to avoid performance impacts.
Built-in object pooling and string deduplication that silently reduce memory allocation pressure.
Commands Overview:
| Command | Description |
|---|---|
/pregen <radius> | Pre-generate chunks around you |
/pregen stop | Stop active pre-generation |
/pregen status | Check pre-generation progress |
/lon tps | Display server TPS |
/lon memory | Show memory usage |
/lon memory gc | Force garbage collection |
Requirements:
Minecraft 26.1.2
Fabric Loader ≥ 0.19.1
Fabric API 0.148.0+26.1.2
Java 25
Recommended Mods:
Pair Lon with Sodium, Lithium, and FerriteCore for the ultimate low-end optimization stack.
Note: An on-screen HUD (FPS/memory display) is planned but temporarily disabled due to Fabric API instability in Minecraft 26.1.2. All commands work in both single-player and multiplayer.
Enjoy smoother gameplay on your PC!
