All The Mods 10 is one of the heaviest modpacks in existence. With over 400 mods spanning tech, magic, exploration, and automation, it pushes server hardware harder than almost any other pack. Getting it to run well requires more than just throwing RAM at the problem.
How Much RAM Does ATM10 Actually Need?
The short answer: 8GB minimum, 10-12GB recommended for 5-10 players, and 16GB+ for larger groups.
But here's the thing most guides get wrong - raw RAM allocation matters less than how the JVM manages it. A server with 12GB of well-tuned memory will outperform a 16GB server with default JVM flags.
RAM Allocation Guidelines
| Players | Minimum RAM | Recommended | Space-Node Plan | |---------|------------|-------------|-----------------| | 1-5 | 8GB | 10GB | MC Emerald (8GB, €10.99/mo) | | 5-15 | 10GB | 12GB | MC Emerald (8GB) or MC Obsidian (16GB) | | 15-30 | 12GB | 16GB | MC Obsidian (16GB, €15.99/mo) | | 30+ | 16GB | 20GB+ | MC Netherite (32GB, €27.99/mo) |
JVM Startup Flags That Actually Help
Forget the generic -Xmx only approach. Modern modded Minecraft benefits enormously from Aikar's flags with some ATM10-specific adjustments:
-Xms10G -Xmx10G
-XX:+UseG1GC
-XX:+ParallelRefProcEnabled
-XX:MaxGCPauseMillis=200
-XX:+UnlockExperimentalVMOptions
-XX:+DisableExplicitGC
-XX:G1NewSizePercent=30
-XX:G1MaxNewSizePercent=40
-XX:G1HeapRegionSize=8M
-XX:G1ReservePercent=20
-XX:G1MixedGCCountTarget=4
-XX:InitiatingHeapOccupancyPercent=15
-XX:G1MixedGCLiveThresholdPercent=90
-XX:G1RSetUpdatingPauseTimePercent=5
-XX:SurvivorRatio=32
-XX:+PerfDisableSharedMem
-XX:MaxTenuringThreshold=1
The key differences from standard Aikar's: we increase G1NewSizePercent to 30 and G1MaxNewSizePercent to 40 because ATM10 creates an enormous number of short-lived objects. This gives the young generation more room before triggering major GC pauses.
Server-Side Performance Tweaks
1. Chunk Loading Distance
Reduce view-distance in server.properties to 8 (default is 10). ATM10's terrain generation is heavily modded, and each extra chunk radius adds significant load. Pair with simulation-distance of 6.
2. Entity Limits
Add to your bukkit.yml or Paper config:
- Reduce ambient mob cap from 15 to 5
- Reduce water ambient from 20 to 5
- Set entity activation range: monsters 24, animals 16, misc 8
3. Disable Unused Mods
If nobody on your server uses a specific mod, disabling it server-side saves memory and tick time. Common candidates: world generation mods after world gen is complete, unused magic mods, redundant minimap mods.
4. Pre-Generate Your World
Use Chunky to pre-generate a 5000-10000 block radius before players join. This front-loads the expensive terrain generation work and makes exploration lag-free.
Storage Matters More Than You Think
ATM10 worlds grow fast. Between modded terrain, player builds, and automation, a mature server can easily hit 20-30GB of world data. NVMe SSD storage eliminates the I/O bottleneck when loading chunks - something that shows up as stuttering when players explore new areas.
At Space-Node, all plans use NVMe SSD storage. For ATM10, we recommend our Emerald plan (8GB RAM, 80GB storage) as a starting point, with easy upgrades to Obsidian (16GB) or Netherite (32GB) as your community grows.
Monitoring Performance
Install Spark on your server. It provides:
- Real-time TPS monitoring
- CPU profiling per-tick
- Memory usage breakdown
- Garbage collection metrics
When TPS drops below 18, check Spark's profiler. The culprit is usually either entity ticking (too many mobs), chunk loading (view distance too high), or a specific mod's tick handler (check if a particular mod dominates the profile).
The Bottom Line on ATM10 Hosting
ATM10 is demanding, but it runs well on properly configured hardware. Start with at least 8GB RAM, use optimized JVM flags, tune your server configs aggressively, and choose a host with modern CPUs and NVMe storage. The difference between a laggy ATM10 experience and a smooth one usually comes down to these details - not just raw specs.
