Fast Noise

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Fast Noise is a modern optimization mod to improve world generation times. I regularly update the mod to latest minecraft versions, bring improvements to the mod, and provide stable releases.

Does the mod change world generation? The mod maintains vanilla parity, including with any datapacks. Do keep in mind, Vanilla non-determinism.

Can I use custom worldgen mods with this? Yes, I try my best to maintain mod compatibility, and only modify safe code. Specific optimizations that may affect mod compatibility are disabled by default.

FastNoise is part of Reverie Projects, check out our other mods as well.

How does this mod work?

Fast noise optimizes storing block and biome data into chunks for the duration of worldgen.

Technical Details

Fast noise replaces populateNoise,populateBiomes in NoiseChunkGenerator and surfaceBuilder in SurfaceBuilder.

Fast noise optimizes world generation by making several strong assumptions about how world generation works. By replacing vanilla's generic and debug code for world storage with faster, more packed calculations, fast noise achieves faster throughput.

Some key methods used to achieve that are, reducing allocations, avoiding palette resizing, delaying/packing block counting, precalculating data,
caching block state information and more.

How fast is it?

About 10-18% improvement to overall worldgen in overworld in 1.21.11 on latest versions.
Much higher improvement in nether, end
Here is a Jmh Benchmark Software.

Chunky benchmark

12 threads w/ mod
[12:39:32] [Server thread/INFO]: [Chunky] Task finished for minecraft:overworld. Processed: 16641 chunks (100.00%), Total time: 0:01:37

W/o mod
[12:43:08] [Server thread/INFO]: [Chunky] Task finished for minecraft:overworld. Processed: 16641 chunks (100.00%), Total time: 0:01:47

4 threads w/ mod
[12:56:23] [Server thread/INFO]: [Chunky] Task finished for minecraft:overworld. Processed: 9409 chunks (100.00%), Total time: 0:01:10
W/o mod
[13:01:11] [Server thread/INFO]: [Chunky] Task finished for minecraft:overworld. Processed: 9409 chunks (100.00%), Total time: 0:01:23

With higher distance
W/o mod
[13:11:01] [Server thread/INFO]: [Chunky] Task finished for minecraft:overworld. Processed: 19881 chunks (100.00%), Total time: 0:02:43
W/ mod
[13:16:03] [Server thread/INFO]: [Chunky] Task finished for minecraft:overworld. Processed: 19881 chunks (100.00%), Total time: 0:02:21

Jmh benchmark

Mods used: FastNoise 1.0.37+26.2 on 26.2
ChunkPos: -16,-16 -> 16,16
End ChunkPos: 112,112 -> 144,144
Chunks: 1089
Mods used: c2me-fabric-mc26.2-0.4.2-alpha.0.9.jar

Benchmark (worldName) Mode Cnt Score Error Units
BiomesBenchmark.biomegen overworld avgt 5 3058.005 ± 256.587 ms/op
BiomesBenchmark.biomegen nether avgt 5 188.188 ± 3.156 ms/op
BiomesBenchmark.biomegen end avgt 5 31.560 ± 4.200 ms/op
NoiseBenchmark.noisegen overworld avgt 5 12332.480 ± 364.223 ms/op
NoiseBenchmark.noisegen nether avgt 5 2447.385 ± 20.773 ms/op
NoiseBenchmark.noisegen end avgt 5 6420.598 ± 195.649 ms/op
SurfaceBenchmark.surface overworld avgt 5 14948.653 ± 333.900 ms/op
SurfaceBenchmark.surface nether avgt 5 9330.611 ± 243.701 ms/op
SurfaceBenchmark.surface end avgt 5 3485.872 ± 8.225 ms/op

Benchmark (worldName) Mode Cnt Score Error Units
BiomesBenchmark.biomegen overworld avgt 5 2980.699 ± 98.824 ms/op
BiomesBenchmark.biomegen nether avgt 5 177.827 ± 2.815 ms/op
BiomesBenchmark.biomegen end avgt 5 14.990 ± 0.575 ms/op
NoiseBenchmark.noisegen overworld avgt 5 9419.623 ± 317.746 ms/op
NoiseBenchmark.noisegen nether avgt 5 1253.599 ± 15.977 ms/op
NoiseBenchmark.noisegen end avgt 5 5424.879 ± 81.860 ms/op
SurfaceBenchmark.surface overworld avgt 5 10490.488 ± 901.258 ms/op
SurfaceBenchmark.surface nether avgt 5 3361.448 ± 53.809 ms/op
SurfaceBenchmark.surface end avgt 5 1.723 ± 0.289 ms/op

Speedup:

Stage/Dimension · Overworld · Nether · The End
Biome · 1.025x · 1.058x · 2.105x
Noise · 1.309x · 1.952x · 1.183x
Surface · 1.424x · 2.775x · 2023.14x

Old Jmh Benchmark

Mods used: Fast Noise 1.0.15+26.1 on 26.1 snapshot-6
ChunkPos: -16,-16 -> 16,16
End ChunkPos: 112,112 -> 144,144
Chunks: 1089
Mods used: (c2me)

With mod:
Benchmark (worldName) Mode Cnt Score Error Units
BiomesBenchmark.biomegen end avgt 5 11.786 ± 0.168 ms/op
BiomesBenchmark.biomegen nether avgt 5 174.833 ± 1.166 ms/op
BiomesBenchmark.biomegen overworld avgt 5 2401.797 ± 31.629 ms/op
NoiseBenchmark.noisegen end avgt 5 3052.242 ± 12.358 ms/op
NoiseBenchmark.noisegen nether avgt 5 1039.086 ± 6.467 ms/op
NoiseBenchmark.noisegen overworld avgt 5 8441.811 ± 41.396 ms/op

With only c2me:
Benchmark (worldName) Mode Cnt Score Error Units
BiomesBenchmark.biomegen end avgt 5 26.058 ± 0.245 ms/op
BiomesBenchmark.biomegen nether avgt 5 185.957 ± 2.203 ms/op
BiomesBenchmark.biomegen overworld avgt 5 2464.937 ± 29.007 ms/op
NoiseBenchmark.noisegen end avgt 5 3925.059 ± 14.292 ms/op
NoiseBenchmark.noisegen nether avgt 5 1920.705 ± 9.864 ms/op
NoiseBenchmark.noisegen overworld avgt 5 11552.674 ± 54.112 ms/op

Vanilla:
Benchmark (worldName) Mode Cnt Score Error Units
BiomesBenchmark.biomegen end avgt 5 27.051 ± 0.118 ms/op
BiomesBenchmark.biomegen nether avgt 5 239.634 ± 1.702 ms/op
BiomesBenchmark.biomegen overworld avgt 5 4589.322 ± 80.331 ms/op
NoiseBenchmark.noisegen end avgt 5 4477.113 ± 36.133 ms/op
NoiseBenchmark.noisegen nether avgt 5 1951.438 ± 5.748 ms/op
NoiseBenchmark.noisegen overworld avgt 5 14249.612 ± 57.388 ms/op

Vanilla:
Benchmark (worldName) Mode Cnt Score Error Units
SurfaceBenchmark.surface overworld avgt 5 5982.828 ± 17.992 ms/op
SurfaceBenchmark.surface nether avgt 5 2677.115 ± 9.293 ms/op
SurfaceBenchmark.surface end avgt 5 924.604 ± 5.376 ms/op

With Mod:
Benchmark (worldName) Mode Cnt Score Error Units
SurfaceBenchmark.surface overworld avgt 5 4820.672 ± 24.669 ms/op
SurfaceBenchmark.surface nether avgt 5 1914.289 ± 644.099 ms/op
SurfaceBenchmark.surface end avgt 5 0.014 ± 0.003 ms/op

Speedup
Overworld: Biome: 1.026x Noise: 1.368x Surface: 1.241x
Nether: Biome: 1.063x Noise: 1.847x Surface: 1.398x
End: Biome: 2.21x Noise: 1.285x Surface: 66357x

The benchmarks may have some inaccuracies.

Socials

FAQ and Help

FAQ

Q- What Minecraft versions will the mod be supporting?
A- I'll try to support the latest minecraft version.

Q- Are backports planned?
A- No backports are planned, current backports were a one time thing.

Q- What other mods/dependencies do I need?
A- No dependencies are required.

Q- Will there be a forge backports for 1.19.x 1.20.x?
A- Not planned.

Q- XYZ mod crashes, or generates incorrectly with Fast Noise?
A- Report the issue on codeberg or my socials.

Incompatible mods

Moonrise is incompatible, as It changes minecraft internals drastically
Noisium is incompatible, as Fast Noise is intended as a replacement for noisium.
Anti-Xray is incompatible for now, as it needs to put extra data in minecraft block storage, which breaks fastnoise

Credits

• Stevenplays, for developing noisium mod, I started developing fast noise while trying to port noisium to latest minecraft.
• Ishland, for helping with mod, and modern-yarn and neo-loom

Reverie Projects

Consider joining the Reverie Projects for sneak peeks and updates on development! By joining, you can:

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• And just hang out with the rest of our community!