Optimizing Arma Reforger Server Performance

Optimizing Arma Reforger Server Performance

Arma Reforger is a demanding game server application. Large terrains, numerous AI entities, physics simulation, and network synchronization all contribute to significant CPU and RAM usage. This guide covers how to optimize your server for the best possible player experience.

Hardware Requirements

Arma Reforger server performance is primarily limited by CPU single-thread performance and available RAM. Below are general guidelines based on player count and mission complexity:

Players	Scenario	Recommended RAM	Notes
1-10	Combat Ops / Light mission	4-6 GB	Basic cooperative play
10-20	Conflict / Medium mission	6-8 GB	Standard multiplayer
20-40	Conflict / Heavy mission	8-12 GB	Large-scale battles
40-64	Campaign / Modded	12-16 GB	Maximum player count
64+	Custom / Heavily modded	16+ GB	Requires top-tier hardware

These are estimates. Actual requirements depend on the number of AI units, view distance settings, mod count, and mission complexity.

CPU Considerations

The Arma Reforger server relies heavily on single-thread CPU performance for the main simulation loop. Key factors:

• Server tick rate directly affects gameplay smoothness and hit registration.
• AI calculation, physics, and network synchronization compete for CPU time.
• Mods that add scripts or AI behavior increase CPU load significantly.

If your server’s tick rate drops below 20 during heavy combat, consider reducing AI count, lowering view distance, or upgrading to a plan with better CPU allocation.

View Distance Optimization

View distance settings have a major impact on both server and client performance:

{
  "gameProperties": {
    "serverMaxViewDistance": 2500,
    "serverMinGrassDistance": 50,
    "networkViewDistance": 1500
  }
}

Setting	Recommended	Performance Impact
serverMaxViewDistance	2000-2500	High — affects terrain and object rendering
networkViewDistance	1000-1500	Very High — affects entity synchronization
serverMinGrassDistance	50-80	Low — affects grass rendering only

Reducing networkViewDistance has the greatest impact on server performance, as it directly controls how far the server synchronizes entities between players. For infantry-focused missions, 1000-1200 meters is sufficient. Vehicle-heavy combat may benefit from higher values.

Headless Client

The headless client is a separate instance of the Arma Reforger server that handles AI calculations off the main server process. This frees up the main server to focus on player synchronization and game state management.

Benefits:

• Reduces CPU load on the main server thread.
• Improves server tick rate during heavy AI scenarios.
• Allows more AI units without degrading player experience.

How it works: The headless client connects to the main server as a special client and takes over AI simulation. The main server delegates AI processing to the headless client, reducing its own computational burden.

Headless client support may require scenario-level configuration. Not all scenarios support it out of the box. Check the scenario documentation or contact the scenario author for compatibility.

RAM Optimization

Memory usage increases with:

• Player count — Each connected player uses memory for state tracking.
• AI units — AI entities consume significant memory.
• Mods — Each loaded mod adds to the memory footprint.
• View distance — Higher view distances require more memory for entity tracking.

If your server approaches its RAM limit, you may experience stuttering, increased load times, or crashes. Monitor your RAM usage in the RespawnHost panel and upgrade if needed.

Network Optimization

Network bandwidth affects player experience, especially with many players and AI units:

• Bandwidth scales with player count and networkViewDistance.
• Position updates for each entity are sent to all relevant players.
• Vehicle-heavy scenarios generate more network traffic than infantry-only games.

For optimal network performance:

1. Keep networkViewDistance at a reasonable level (1000-1500).
2. Limit AI count in scenarios with many players.
3. Choose a server location close to your player base.
4. Monitor network usage in the RespawnHost panel.

Monitoring Server Performance

Use the RespawnHost panel to monitor key metrics:

• CPU usage — Should stay below 80% during normal gameplay.
• RAM usage — Should have at least 20% headroom.
• Server FPS / Tick rate — Aim for 30+ during combat. Below 20 indicates performance problems.
• Network throughput — Monitor for unusual spikes or sustained high usage.

The server console also provides performance information. Use admin commands to check server state:

Command	Purpose
#monitor	Display server performance metrics
#debug <option>	Access debug information

Scheduled Restarts

Regular restarts help maintain performance by clearing memory leaks and resetting the server state. Recommended restart schedule:

Player Count	Restart Frequency
Under 20 players	Every 12 hours
20-40 players	Every 8 hours
40+ players	Every 6 hours

Set up automatic restarts through the RespawnHost scheduled tasks feature. Schedule restarts during off-peak hours to minimize disruption.

Frequently Asked Questions

Why is my server lagging during heavy combat?

Heavy combat increases CPU load from ballistics calculation, hit detection, damage processing, and entity synchronization. Reduce AI count, lower view distance, or upgrade your server plan.

How much RAM do I need for 40 players?

For 40 players on the Conflict scenario, 10-12 GB of RAM is recommended. If you are running mods, add 2-4 GB depending on the number and size of mods.

Does BattlEye affect server performance?

BattlEye has a minor performance overhead. On most servers, the impact is negligible (typically under 5% CPU). The security benefits far outweigh the minimal performance cost. Keep BattlEye enabled.

Can I run a 64-player server on a small plan?

A 64-player server requires significant CPU and RAM resources. Running it on an undersized plan will result in poor tick rates, lag, and potential crashes. Use the Battalion or General Staff plan for large player counts.

How do I check my server’s tick rate?

Connect to your server as an admin and use the #monitor command in the chat. The console output will display the current server FPS, which corresponds to the tick rate.

Does reducing view distance affect gameplay?

Yes. Lower view distance means players and vehicles become invisible at shorter ranges. For infantry combat, 1000-1500 meters is usually sufficient. For vehicle combat, you may want 2000+ meters. Balance performance with the gameplay experience you want to provide.

Should I disable AI to improve performance?

If your mission does not require AI, disabling them via disableAI: true in the operating section of server.json will improve performance. For cooperative missions against AI, reduce the AI count instead of disabling them entirely.