Pre-generate the world and set a world border

Lag when players explore new areas or fly with elytra.

Generating new chunks is expensive; pre-generate the area inside a world border before players explore.

Before you start: The Chunky plugin (Plugins tab) or mod, and a quiet time (it takes a while).

Step by step

1. Choose a size, for example a 5,000-block radius around spawn.
2. Install Chunky (and ChunkyBorder for a border) from the Plugins tab and restart.
3. Run: chunky radius 5000, then chunky start. Progress shows in the console.
4. Let it finish; you can stop and resume with chunky pause / chunky continue.
5. Set a world border so players cannot leave the generated area: worldborder set 10000 (diameter).
6. Repeat for the nether and end if needed.
7. Run pre-generation when few players are online; it uses a lot of CPU while it runs.

Check it worked: Exploring and elytra flight no longer drop TPS.

Why it happens: Every new chunk is generated live, which stalls the server when players move fast.

Disk use grows with pre-generation; check your plan has space.

More guides on RAM, CPU, performance, and lag:

• Find out why your server lags
• Out of memory errors
• RAM always shows high in the panel
• High CPU usage
• Too many entities, mob farms and item build-ups
• Redstone and hopper lag