Choosing the right amount of RAM is critical for a smooth modded experience. While “more is better” is often the rule, over-allocation can sometimes lead to garbage collection stutters. This guide helps you find the “sweet spot” for your community.
| Reading Time | Difficulty | Last Updated |
|---|
| 5 minutes | Beginner | January 2026 |
Modpack Tiers
The complexity of your modloader (Forge/Fabric) and the number of loaded assets determine your baseline memory usage.
| Tier | Pack Examples | Recommended RAM |
|---|
| Light | FTB Lite, Vanilla+ | 3 GB - 4 GB |
| Medium | All the Mods 9, Stoneblock | 6 GB - 8 GB |
| Heavy | RLCraft, SkyFactory 4, GregTech | 10 GB - 12 GB+ |
Player Density Scaling
As players explore different dimensions and generate new chunks, the RAM requirement increases.
- Small Group (2-5 Players): Baseline pack requirements + 1 GB.
- Medium Community (10-20 Players): Baseline pack requirements + 4 GB.
- Large Network (30+ Players): Consider splitting worlds into a “BungeeCord” or “Velocity” proxy network.
Optimization Techniques
1. Pre-generating Chunks
Most modded lag occurs when the server tries to generate house-sized Biomes O’ Plenty trees in real-time. Use a plugin like Chunky to pre-generate your world border.
2. Aikar’s Flags
Ensure your startup parameters are optimized for memory management. FREAKHOSTING uses optimized JVM flags by default to minimize “Garbage Collection” (GC) lag spikes.
3. Profiling
If your server is lagging but RAM usage looks low, use Spark (/spark profiler) to identify if the bottleneck is actually CPU-bound physics or entity AI.
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Last Updated: January 2026 | Performance: Peak efficiency.