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Bye?Pregen!

Reduce MSPT spikes and server freezes caused by world generation.
by moepus
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20,846 downloads
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Updated Jul 6, 2026
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Performance Utility & QoL World Gen

This mod optimizes world-generation block placement, post-processing, and the cascading chunk-loading requests that post-processing can trigger. Combined with reduced memory allocations, it significantly lowers the performance cost of terrain generation and exploration.

BACKUP YOUR SAVE DATA BEFROE USE

Features

  • Lower MSPT during chunk generation
  • Less server freezing during chunk generation
  • Fewer cascading chunk-request
  • Reduced memory allocation overhead

Compatibility:

Automatically disables C2ME's FluidPostProcessingFilter option

Test Environment

  • Mods: C2ME + Lithium
  • Render Distance: 43 chunks
  • Memory: 12 GB RAM

Before:

After:

Results

  • Average tick time reduced from 19 ms to 11 ms
  • Maximum tick time reduced from 115 ms to 48 ms
  • Significantly fewer MSPT spikes during terrain generation

Detailed Compare with Bye?Pregen 1.0.4

 

byepregen-1.0.7.jar
MC 1.21.1, NeoForge, Server
Alpha 2026-06-29 Get
byepregen-1.0.2.2.jar
MC 1.20.1, Forge, Server
Release 2026-06-25 Get
byepregen-1.0.6.1.jar
MC 1.21.1, NeoForge, Server
Beta 2026-06-24 Get
byepregen-1.0.2.jar
MC 1.20.1, Forge, Server
Beta 2026-06-20 Get
byepregen-1.0.1.jar
MC 1.20.1, Forge, Server
Alpha 2026-06-07 Get

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