# ChunkyFast ChunkyFast is a high-performance chunk pregenerator for **Paper 1.21.x**. It provides a clean, predictable workflow for pregenerating terrain, supports running **multiple world jobs in parallel**, and includes built-in scheduling and load control. --- ## Key Features - **Async chunk generation** using Paper’s async chunk API - **Multi-world pregeneration**: run jobs for multiple worlds at the same time - **Global scheduler**: shared budgets across all active jobs so load does not scale linearly with the number of worlds - **MSPT-based limiter**: dynamically adjusts throughput to keep average tick time near your configured target - **Region-friendly traversal**: chunk iteration optimized for better region (.mca) locality - **Optional skipping of already-generated chunks** using region header scanning (fast, non-blocking) - **Auto-save + auto-resume**: job state is persisted and can resume after restart - **MiniMessage** formatting for all plugin messages --- ## Supported Versions - **Paper**: 1.21.x - **Java**: 21+ --- ## Installation 1. Download the latest release from **GitHub Releases**. 2. Put `ChunkyFast.jar` into your server `plugins/` folder. 3. Start the server once to generate the default config. 4. Adjust `plugins/ChunkyFast/config.yml` if needed. 5. Use the commands below. --- ## Commands Main command: `/chunkyfast` Aliases: `/cf`, `/cfast` ### Start pregeneration All coordinates and radii are in **CHUNKS** (not blocks). `/chunkyfast start circle [centerX centerZ]` `/chunkyfast start square [centerX centerZ]` `/chunkyfast start rect ` `/chunkyfast start worldborder` --- ### How ChunkyFast Differs From Chunky ChunkyFast and Chunky aim at the same outcome (pregenerating terrain), but they emphasize different things. **ChunkyFast focuses on** - **Multi-world parallel jobs** with a **global scheduler** - **MSPT-driven throughput control** (limiter adjusts workload to keep tick time stable) - A lean workflow with minimal overhead - Optional **non-blocking** “already generated” detection via region header scanning **Chunky focuses on** - A long-established, highly feature-rich pregeneration ecosystem - Extremely broad configuration and safety controls - Mature workflows for a wide variety of server environments Practical takeaway: ChunkyFast is built around multi-world scheduling and MSPT-based control, while Chunky is a feature-complete, widely adopted solution with deep tooling and history. --- ### Notes - Pregeneration speed is typically limited by **CPU world generation** and **disk I/O** for region writes. - For best results, run pregeneration when the server has enough resources available.

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