Async is a Fabric mod designed to improve entity performance by processing them in parallel using multiple CPU cores and threads.
Async is currently in alpha testing and is experimental. Its use may lead to incorrect entity behavior and crashes. It may be even more unstable on 1.20.1!
- ⚡ Improved TPS: Maintains stable tick times even with a large number of entities.
- 🚀 Multithreading: Utilizes multiple CPU cores for parallel entity processing.
- 🎲 Async Random Ticks (Experimental): Processes random ticks asynchronously for better performance.
| Configuration | TPS | MSPT |
|---|---|---|
| Lithium + Async | 20 | 41.8 |
| Lithium (without Async) | 4.4 | 225.4 |
| Purpur | 5.72 | 176.18 |
- Processor: AMD Ryzen 9 7950X3D
- RAM: 64 GB (16 GB allocated to the server)
- Minecraft Version: 1.21.4
- Number of Entities: 9000
- Entity Type: Villagers
Mod List
Concurrent Chunk Management Engine, Fabric API, FerriteCore, Lithium, ScalableLux, ServerCore, StackDeobfuscator, TT20 (TPS Fixer), Tectonic, Very Many Players, Fabric Carpet.⚠️ If you find an incompatible mod for 1.20.1 report it to ME not AxolotL.
If you encounter issues with other mods, please report them on my GitHub.
/async config toggle— Enables or disables the mod in-game (no server restart required). Use this command to instantly see how Async improves your server./async config setAsyncEntitySpawn— Enables or disables parallel mob spawn processing (disabled by default). Warning: Not compatible with Carpet mod lagFreeSpawning rule./async config setAsyncRandomTicks— Enables or disables async random ticks processing (experimental feature)./async config synchronizedEntities add— Adds selected entity to synchronized processing./async config synchronizedEntities remove— Removes selected entity from synchronized processing./async stats— Displays the number of threads in use./async stats entity— Shows the number of entities processed by Async in various worlds./async stats entity [number]— Shows the top [number] entity types by count in descending order. For example,/async stats entity 10displays the top 10 most numerous entity types.
The mod is available here at Releases
Full support is provided for 1.20.1 sometimes :P
Use original Async's tracker for FEEDBACK ONLY (if your coming from 1.20.1) available on GitHub. Changes made there might slowly drizzle down to this fork:
You can also chat with me on their Discord:
This mod is based on code from MCMTFabric, which in turn was based on JMT-MCMT. Huge thanks to Grider and jediminer543 for their invaluable contributions!