Fast Surface

Evidence

Server-side mod: Kiln runs mods' code on Horizon's single-player server, not on dedicated servers.

What it needs from Kiln

• an access widener
• Mixin
• net.minecraft.util.BitStorage
• net.minecraft.world.level.ChunkPos
• net.minecraft.world.level.biome.BiomeManager
• net.minecraft.world.level.biome.Biomes
• net.minecraft.world.level.chunk.BlockColumn
• net.minecraft.world.level.chunk.ChunkAccess
• net.minecraft.world.level.chunk.Configuration
• net.minecraft.world.level.chunk.LevelChunkSection
• net.minecraft.world.level.chunk.LinearPalette
• net.minecraft.world.level.chunk.Palette
• net.minecraft.world.level.chunk.PalettedContainer
• net.minecraft.world.level.chunk.PalettedContainer.Data
• net.minecraft.world.level.chunk.SingleValuePalette
• net.minecraft.world.level.chunk.status.ChunkStatus
• net.minecraft.world.level.levelgen.Heightmap
• net.minecraft.world.level.levelgen.Heightmap.Types
• net.minecraft.world.level.levelgen.NoiseChunk
• net.minecraft.world.level.levelgen.RandomState
• net.minecraft.world.level.levelgen.WorldGenerationContext
• net.minecraft.world.level.levelgen.densityfunction.DensityVolume
• net.minecraft.world.level.levelgen.material.MaterialRuleContext
• net.minecraft.world.level.levelgen.material.MaterialSystem
• net.minecraft.world.level.levelgen.material.rule.BlockRule
• net.minecraft.world.level.levelgen.material.rule.MaterialRule
• net.minecraft.world.level.levelgen.material.rule.RuleEvaluator
• net.minecraft.world.level.material.FluidState
• FabricLoader.isModLoaded()
• Blocks.DEEPSLATE
• BlockState.getFluidState()

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

A vanilla worldgen optimization mod to optimise block calculations during surface builder

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file zfastsurface-1.0.0+26.3.jar. The scan reads the mod's classes; it does not run them.