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No Mo Culling

Project Zomboid Guide • Updated Jan 6, 2026

No Mo Culling Mod Guide

The No Mo Culling mod, formerly known as Zombie Fix, addresses a critical performance issue in Project Zomboid where zombies disappear when the count exceeds 500 or when being kited over long distances. This comprehensive guide covers installation, troubleshooting, and alternative solutions for maintaining zombie population stability on your server.

Understanding the Culling Issue

What is Zombie Culling?

Zombie culling is the game's built-in performance optimization that removes zombies from the world when certain thresholds are reached:

  • Population Limit: Zombies disappear when total count exceeds 500
  • Distance Culling: Zombies removed when players move too far away
  • Performance Protection: Prevents server crashes from excessive entity load

Why This Matters

While culling protects performance, it can negatively impact gameplay by:

  • Breaking immersion during large zombie encounters
  • Creating unfair advantages when kiting hordes
  • Reducing challenge in high-population scenarios
  • Causing inconsistent difficulty spikes

Installation Guide

Step 1: Download Required Files

Download the mod files from the official GitHub repository:

Important: Ensure you download both files - they work together to fix the culling issue.

Step 2: Access Server Files

  1. Log in to your server control panel
  2. Open the File Manager
  3. Navigate to the server directory structure

Step 3: Upload Mod Files

  1. Navigate to /server-files/java/zombie/popman
  2. Right-click and select "Upload Files"
  3. Upload both NetworkZombiePacker.class and ZombieCountOptimiser.class
  4. Confirm file replacement when prompted
Warning: These files will replace the default game files. Create a backup before proceeding.

Step 4: Restart Server

  1. Return to server control panel
  2. Restart the server to apply changes
  3. Verify mod is working by testing with large zombie populations

Configuration and Optimization

Performance Considerations

While No Mo Culling fixes zombie disappearing, it can impact server performance:

  • RAM Usage: More zombies require additional memory
  • CPU Load: Increased entity processing demands
  • Network Traffic: More data transmitted to clients

Recommended Server Settings

Optimize your server for higher zombie populations:

Setting Recommended Value Purpose
Max Players Reduce by 25% Free resources for zombies
Zombie Count 2.0x - 4.0x Take advantage of fix
Item Respawn Normal or Fast Maintain gameplay balance

Troubleshooting

Common Issues and Solutions

Mod Not Working:

  • Verify both files were uploaded correctly
  • Check file permissions (should be readable)
  • Confirm server restart completed successfully
  • Test with admin commands to spawn zombies

Server Crashes:

  • Reduce zombie multiplier settings
  • Increase server RAM allocation
  • Check for conflicting mods
  • Monitor server logs for error messages

Performance Issues:

  • Lower zombie count multiplier
  • Optimize server tick rate
  • Reduce view distance settings
  • Consider server hardware upgrade

Alternative Solutions

Other Anti-Culling Mods

If No Mo Culling doesn't work for your setup, consider these alternatives:

  • More Zombies Mod: Increases zombie spawn rates
  • Superior Zombies: Enhanced zombie AI and behavior
  • Population Control: Customizable zombie management

Server-Side Optimizations

Improve performance without mods:

  • Adjust Zombie Settings: Fine-tune spawn rates and multipliers
  • Optimize Network: Configure bandwidth and update rates
  • Hardware Upgrades: Increase RAM and CPU resources
  • World Settings: Reduce map size or complexity

Best Practices

Server Management

For optimal performance with No Mo Culling:

  • Regular Monitoring: Watch server resource usage
  • Backup Strategy: Create backups before mod installation
  • Player Communication: Inform players about increased difficulty
  • Performance Testing: Test with various zombie populations

Gameplay Balance

Maintain fair gameplay:

  • Difficulty Scaling: Adjust zombie rates based on player count
  • Resource Balance: Ensure adequate supplies for increased threats
  • Rule Enforcement: Establish clear server rules for new gameplay
  • Regular Updates: Keep mod updated with game patches

Frequently Asked Questions

Will No Mo Culling work with other mods?

Generally yes, but test for conflicts. Other zombie-related mods may interfere with functionality.

Does this mod affect client performance?

Yes, clients with lower-end hardware may experience reduced FPS with more zombies on screen.

Can I adjust the zombie limit?

The mod removes the 500-zombie limit, but server performance will still impose practical limits.

Is this mod safe for multiplayer?

Yes, it's designed for multiplayer servers. All players will see the same zombie population.

What happens if I remove the mod?

The game will revert to default culling behavior. Existing zombies may disappear.

How do I know if the mod is working?

Test by attracting large zombie hordes. If they don't disappear after 500+ zombies, the mod is working.

Can I customize the culling settings?

This specific mod removes culling entirely. For customizable options, consider alternative mods.

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