Fast Surface
Players on a server running worldgen optimizations can skip slow surface builds, because Fast Surface replaces the vanilla surface builder with a faster version for the overworld, nether and end.
What it does
The mod speeds up surface building by packing, rewriting and batching chunk data reads and writes, and it swaps the buildSurface function for an optimized version. The author reports about 40% faster surface building in the overworld, about 170% faster in the nether and near-instant results in the end.
The mod keeps vanilla parity, including with datapacks, although vanilla non-determinism still applies. When it meets modded content it falls back to normal execution, but mods that add custom code to the surface builder through mixins may not work. ZConfig is required, and the mod is incompatible with Moonrise. Players join without it, since only the server has to run the mod. Builds exist for 26.2 and 26.3 on Fabric and Quilt, and the mod is open source under the Mozilla Public License 2.0.
Key features
Packed chunk data access
Chunk data reads and writes during surface building are packed and rewritten into a single optimized pass.
Replaced surface builder
The buildSurface function is replaced with an optimized version that the mod installs on the server.
Vanilla parity
Output follows vanilla surface generation, including datapack changes, so generated terrain stays consistent.
Modded content fallback
Where modded surface code is found, the mod runs the normal vanilla path instead of the optimized one.
Gallery
Compatibility
Latest build for each game version and loader.
This mod also publishes snapshot builds. Snapshots are not shown in the matrix.
Requirements
Dependencies declared by the latest file for each loader.
Use cases
Faster new chunk generation
Servers that generate large areas of new terrain can spend less time on each chunk during surface building.
Nether and end exploration
Servers with heavy nether and end exploration benefit from the larger speedups reported for those dimensions.
Who it’s for: Server owners who want faster world generation on Fabric or Quilt, and who run the pack on 26.2 or 26.3 with ZConfig installed and no Moonrise.
Questions
Does Fast Surface need to be installed on clients?
Which dependency does Fast Surface require?
Does Fast Surface work with Moonrise?
Can Fast Surface be used with custom worldgen mods?
In the catalog
Fast Surface is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.
More from Reverie Projects
Similar mods
What the author says
Fast Surface is a vanilla worldgen optimization mod, that optimizes block collections in surface builder. Does the mod change world generation? The mod maintains vanilla parity, including with any datapacks. Do keep in mind, Vanilla non-determinism.
Official listing
- Modrinth page
- modrinth.com/mod/zfastsurface
- Owner
- Reverie Projects
- Published
- 2026-08-29
- Updated on Modrinth
- 2026-10-01
- Facts verified
- 2026-10-15