FarmCollisionless

FarmCollisionless is a lightweight optimization mod designed to improve the performance of mob farms and entity-heavy areas.

When too many entities are crowded together, Minecraft spends a large amount of time handling collisions and push mechanics. This mod introduces the concept of collisionless chunks: areas where entities no longer collide with each other or push one another, significantly reducing server lag without breaking core gameplay.

Features

• Collisionless Chunks Toggle chunks into a "collisionless" state where mobs don’t collide or push against each other, improving tick performance.

• Automatic Farm Detection (configurable) Automatically detects mob farms based on entity counts per chunk and applies collisionless mode when needed.

• Flexible Control

  • Crouch + place/break the configured "provider block" (default: fences) to mark/unmark collisionless areas.
  • /collisionless here to toggle the current chunk.
  • /collisionless dump to list all collisionless chunks in your dimension.
  • /collisionless clear to reset them.
  • /collisionless reload to reload config.

• Entity Tracking & Filtering

  • Option to skip hostile mobs (so only peaceful farms are affected).
  • Whitelist support for controlling which entities are included.
  • Configurable detection interval and entity thresholds.

Configuration

All options are available in farmcollisionless.json (generated automatically).

• CollisionlessProvider Block type used to manually mark/unmark chunks as collisionless (default: minecraft:fence).

• AutoDetectFarm (true/false) Whether to automatically detect farms based on entity counts.

• SkipEnemyMonsterFarm (true/false) If true, hostile mobs are excluded from collisionless detection (only peaceful farms are affected).

• TheNumberOfEntitiesInAChunkThatValidatesDetection (integer) Threshold of entities per chunk required before a chunk is considered a farm and made collisionless.

• DetectionIntervalTicks (integer) How often (in ticks) to run automatic detection. Default is 20 (1 second).

• RequireOPForCollisionlessChunkActivation (true/false) If true, only OP players can (de)activate collisionless chunks when they shift + place/remove provider.

• FarmEntitiesRegistryNameWhitelist (list of strings) If non-empty, only entities in this whitelist will be counted and affected. Example:

  "FarmEntitiesRegistryNameWhitelist": [
    "minecraft:cow",
    "minecraft:sheep"
  ]

Benefits

• Reduces lag in mob farms by removing unnecessary collision calculations.
• Keeps gameplay intact—entities still spawn, move, and interact normally outside collisionless chunks.
• Server-friendly and designed for large-scale survival or technical play.

Perfect for technical players, performance-focused servers, and anyone running entity-heavy farms who want to keep their game smooth without disabling vanilla mechanics.