Forge Minecraft Server Performance Guide
How to optimize your Minecraft Forge server for better TPS and less lag.
Forge servers are heavier than vanilla or Paper. Here's how to keep performance acceptable.
Performance Mods for Forge
| Mod | Purpose |
|---|---|
| Spark | Profiler — find what's causing lag |
| FerriteCore | Reduce RAM usage |
| Clumps | Groups XP orbs to reduce entity count |
| Fastload | Faster world loading |
| Chunky | Pre-generate chunks to eliminate gen lag |
Configuration Tips
server.properties
view-distance=8
simulation-distance=6
max-tick-time=-1JVM Flags
Apply Aikar's JVM flags — they help Forge servers significantly.
RAM Allocation
Forge modded servers need more RAM:
- Small modpack (50 mods): 4–6 GB
- Medium modpack (100 mods): 6–8 GB
- Large modpack (200+ mods): 8–12 GB
⚠️ Don't over-allocate — giving 16GB when you need 6GB makes GC pauses worse.
Identifying Lag Sources
Install Spark and run:
/spark profiler startWait 5 minutes, then:
/spark profiler stopThe generated report shows exactly which mods/tasks consume the most tick time.
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