Generator Accelerator (formerly Moonrise Generator Accelerator)

Performance go brrr.

As of 1.5, we've reworked major parts of the mod, so there may be conflicts with other optimization mods such as Moonrise and C2ME. Versions below should be mostly compatible without any major issues.

What is this?

Generator Accelerator is a massive optimization mod featuring many noise and concurrent chunk management optimizations. This mod provides significant performance boost on servers and singleplayer worlds. Instead of many other attempts to recreate another complex system to workaround the whole chunk system, we were using a more invasive approach. We've tried to optimize everything we could touch without breaking most mods by reworking Minecraft worldgen pipelines.

Please note, that this mod is in ALPHA stage of development. Something may break. Something may crash. Here be dragons, do backups.

At the moment of writing, performance boost may vary from the modpack and the user's PC setup. The proper benchmark will appear there a bit later.

Why use this mod?

Moonrise or C2ME rewrites the chunk system and for many vanilla-like setups its speed is already more than enough.

However, on:
- large modpacks with many worldgen features,
- servers that generate a lot of new terrain,
- aggressive pregen / exploration-heavy gameplay,
- CPU-bound generation scenarios,

…extra parallelism and generator-side optimizations can still provide a noticeable improvement.  
That’s where Generator Accelerator comes in!

How to use?

For Players and Modpack Developers

Download the respective generator-accelerator-<minecraft-version>-<generator-version>.jar and put into the mods folder respectively.

For Mod Developers

The project as of 31/01/26 is now open-source and licensed under GPLv3 license. You can contribute to the project and help improving the GA project by creating PR. We're still learning and there can be mistakes by us, so don't hestitate to contact us through Issues or PRs for any problems or incompatibilities.

1.5 versions and beyond are under Polyform Shield 1.0.0 License.

Credits

If you believe that we forgot something for attribution, please raise up an Issue so we could fix it immediately, thank you.

• Moonrise for their chunk system foundation this project builds upon. Licensed and used under MIT License.
• CanvasMC by Dueris for their some noise-related optimization ideas this project builds upon. Licensed and used under GPLv3 License.
• C2ME for their few mixins, such as MixinConfiguredFeature and MixinOreFeature. Also MixinNoiseBasedAquifer$optimize_noise and MixinBeardifier were used as part of the CanvasMC project logic, which is originally from C2ME too.

Ports/Backports?

This project is so huge, so it is very hard to maintain this across Minecraft versions. At the moment, Forge/Fabric 1.20.1 and Fabric/NeoForge 1.21.1 are the only versions/modloaders supported at the moment.

• 1.7.10, 1.12.2 or any other version <1.20.1? No. It will require a lot of work from us to port over these versions.
• 26.1, 1.21.11? The time will see, we'll update the mod when new modding version settles in. We won't be chasing version to spend more time on new features and optimizations. However, some alpha builds may come later just to make sure our codebase is ready for the new LTS modding version.