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Sleepium

A performance engine for servers and clients that keeps the game exact: idle ticks put to sleep, a compiled event bus, parallel worldgen, a fast renderer with its own shaderpack support (beta).
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Sleepium 1.1.11 for 1.20.1 (Forge)

File namesleepium-1.1.11-mc1.20.1-forge.jar
Uploader
ha7gawaha7gawa
Uploaded
Nov 9, 2026
Downloads
29
Size
2.9 MB
Mod Loaders
Forge
File ID
9526028
Type
R
Release
Supported game versions
  • 1.20.1

Curse Maven Snippet

Forge

implementation fg.deobf("curse.maven:sleepium-1780057:9526028")

Learn more about Curse Maven

What's new

  • World generation with datapacks like JJThunder To The Max: up to 2x faster. To pick a biome, the game works out a few "climate" values for every 4x4x4 block cell. Most of them do not depend on height, and vanilla's own world generation marks those so they are computed once per column. Datapacks that leave the mark out make the game compute them again for every cell up the column - in JJThunder's 2 000-block-tall world that is about 500 times per column, over 60 % of all generation time. Sleepium now finds the parts that do not depend on height by reading the datapack's own functions and computes them once per column. The result is the same world, block for block and biome for biome (checked by comparing every generated chunk with the change on and off). JJThunder with Chunky: 108-116 -> 195-233 chunks per second (vanilla 37). A normal world and Biomes O' Plenty are already marked: no change there. A setting (World generation -> WorldgenColumnMemoMixin), on by default; both 1.21.1 and 1.20.1.

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