Ultra Fast Pregen
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Ultra Fast Pregen pre-generates your world much faster than other pre-generators by using every CPU core, so players never wait on chunk generation.
Curse Maven Snippet
What's new
Ultra Fast Pregen 14 for NeoForge 26.1.2
Requires NeoForge 26.1.2, Java 25+. Server side only (works in singleplayer).
First release for NeoForge 26.1.2, with everything the other builds have.
Faster
- Worldgen-heavy worlds: feature placement skips Minecraft's per-call chunk checks inside a batch, and
matching_blockspredicates compare blocks directly (Tectonic + WWOO + C2ME: 127.8 → 156.8 chunks/s, measured on NeoForge 26.1.2). - No more waiting for the previous batch's lighting: the batch's last tasks go first (with C2ME: 354.2 → 378.1 chunks/s, measured on NeoForge 26.1.2).
- Air above the aquifer's sampling height is filled without per-block work (vanilla worldgen: 306.4 → 332.8 chunks/s).
- Modpacks keep the fast terrain path: the check of other mods' mixins now looks at the methods they actually change, so mixins that only add accessors or touch other methods no longer slow it down.
Safer
- Safety net: if a batch fails on the fast paths (usually another mod's code that does not expect them), it is generated again the way Minecraft does and the run carries on; the log names the mods involved. Before, the run stopped.
- Lighting can no longer hang: a batch whose light makes no progress for 3 minutes stops with a message.
- Moonrise is not supported yet:
/pregen startnow says so and starts nothing, instead of failing with an error. - Light at batch edges no longer depends on timing.
Speed against Chunky
Ryzen 5 7500F (6 cores), this build (NeoForge 26.1.2), a fresh 3,000 × 3,000 block area, average of 2 runs:
| World | Chunky | Ultra Fast Pregen |
|---|---|---|
| Overworld | 107.2 chunks/s | 332.8 chunks/s (3.10×) |
| Overworld, Tectonic + WWOO | 23.0 | 121.1 (5.25×) |
| Overworld + C2ME | 282.5 | 378.1 (1.34×) |
| Overworld, Tectonic + WWOO + C2ME | 97.0 | 156.8 (1.62×) |
| Nether | 106.0 | 445.1 (4.20×) |
| Nether + C2ME | 394.9 | 460.6 (1.17×) |
| End | 752.1 | 1,079.7 (1.44×) |
| End + C2ME | 992.2 | 1,113.8 (1.12×) |
Tested on this build
- The automated test suite passes: blocks, biomes and light identical to Minecraft's own generation (Overworld, Nether, End and the other world presets), batch edges, stopping and resuming, joining existing areas, and the safety net.
- On a dedicated server, in the Overworld, Nether and End with every saved chunk checked, alone and together: C2ME; Lithium; Lithium, ScalableLux, FerriteCore, ModernFix; Distant Horizons; Terralith, Biomes O' Plenty, YUNG's Better Caves; all of them together. All passed.
- Every saved chunk goes straight into Distant Horizons' LoD database.
- Moonrise: refused with a message, as intended (not supported yet).
Full results and the tested mod versions: https://github.com/Pongsapat3791/Ultra-Fast-Pregen/blob/main/COMPATIBILITY.md
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