AsyncPrefab is a server-side Hytale plugin that makes large prefab loading and pasting fully non-blocking.
Paste millions of blocks without freezing your server or crashing clients.
Hytale’s built-in prefab system runs entirely on the world thread.
For large prefabs (4M+ blocks), this can cause:
EditorBlocksChange packetsLarge-scale world editing becomes unstable and risky.
AsyncPrefab intercepts the prefab pipeline and makes everything asynchronous and batched.
When selecting a .prefab.json, the file loads on a background thread instead of the world thread.
Prefabs over ~4M blocks can generate packets too large for the client.
AsyncPrefab safely blocks these packets to prevent crashes.
Block placement is split into configurable batches (default: 50,000 blocks every 200ms).
Every async paste captures the original blocks.
/asyncundo/asyncredoUndo and redo are also processed in batches — no freezing.
After a paste completes, cached prefab data and selections are cleared to free memory.
| Command | Description | Permission |
|---|---|---|
/paste |
Async replacement for the built-in paste | hytale.editor.selection.clipboard |
/asyncpaste <prefab> [x y z] [batchSize] [batchDelay] |
Load and paste a prefab asynchronously | asyncprefab.paste |
/asyncundo |
Undo last async paste | asyncprefab.undo |
/asyncredo |
Redo last undone async paste | asyncprefab.redo |
All commands require Creative mode.
AsyncPrefab automatically intercepts the built-in Paste Tool.
Click to paste as normal — placement is automatically redirected to async batched processing.
No configuration required.
.jar into your server’s mods/ folderWorks out of the box.
Tested with an 8.2 million block prefab:
| Operation | Vanilla | AsyncPrefab |
|---|---|---|
| Prefab selection | 8+ second freeze | 0 second freeze |
| Block paste | Server hang / client crash | Batched & non-blocking |
| Memory retention | Cached indefinitely | Automatically cleaned |
AsyncPrefab exposes a service API for other plugins.
Example:
AsyncPrefabService service = Asyncprefab.getService();
service.paste(world, "my_prefab.prefab.json", position, PasteOptions.defaults());Custom batch sizes and delays are configurable via PasteOptions.
Discord:
https://discord.gg/KPzSCm83Km
MIT
Author: IPv5
A modern voting plugin for Hytale with V1, V2, and HTTP support. Includes Vote Party, streak rewards, reminders, custom UI menus, and full server-list compatibility.
A modern voting plugin for Hytale with V1, V2, and HTTP support. Includes Vote Party, streak rewards, reminders, custom UI menus, and full server-list compatibility.