Structure Layout Optimizer Mod (1.21.7, 1.20.1) improves the performance of Jigsaw structure generation in Minecraft by replacing inefficient VoxelShape intersection checks with more efficient BoxOctree-based calculations.

In vanilla Minecraft, structure piece intersections were verified by comparing all VoxelShape vertices—causing noticeable delays, especially in large or complex builds. This mod replaces the standard VoxelShape with a dummy version containing a BoxOctree, which only checks intersections against neighboring parts. The result? Drastically reduced validation time and smoother generation of massive, recursive Jigsaw structures.

Features:

  • Replaces vanilla’s slow VoxelShape checks with a BoxOctree system that only compares nearby structure pieces—cutting down on lag during generation2.
  • Skips unnecessary checks for Jigsaw Blocks that are blocked or facing boundaries, saving CPU cycles.
  • Filters out irrelevant positions early when loading large NBT files, improving load times for massive structures.
  • Reduces redundant calls to block properties and simplifies NBT data parsing for Jigsaw Blocks.
  • Avoids rechecking duplicate structure pieces with high weights, and optionally deduplicates the pool for even faster generation (at the cost of seed layout parity).
  • Swaps heavy StructureBlockInfo lists with lightweight palettes that shrink memory usage when structures aren’t actively generating.

Screenshots:

Requires:

Minecraft Forge or Fabric API or Quilt Loader or NeoForge Installer

How to install:

How To Download & Install Mods with Minecraft Forge

How To Download & Install Fabric Mods

How To Download & Install The Quilt Loader

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Structure Layout Optimizer Mod (1.21.7, 1.20.1) Download Links

For Minecraft 1.16.5

Forge Version: Download from Server 1

Fabric Version: Download from Server 1

For Minecraft 1.18.2

Forge Version: Download from Server 1

Fabric Version: Download from Server 1

For Minecraft 1.19.2

Forge Version: Download from Server 1

Fabric Version: Download from Server 1

For Minecraft 1.20.1, 1.20

Forge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.1, 1.21

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.4

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.5

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

For Minecraft 1.21.7, 1.21.6

NeoForge Version: Download from Server 1 – Download from Server 2

Fabric Version: Download from Server 1 – Download from Server 2

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