Fast Noise

Mod

by zenxarch

This optimizes noise generation

Type

Mod

CurseForge Downloads

5,481,576

CurseForge ID

1460602

Modrinth Downloads

9,048,755

Modrinth ID

OnlVIpq5

Last Updated

Nov 6, 2026

Description

Keep Android Open | Contact Regulators to stop Google's lockdown of Android

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