Use a chunk preloading mod or plugin
Install Chunky on Paper, Spigot, or Fabric/Forge if supported
Set the world center with the plugin command
Define the radius you want to preload
Start the preloading task
Let it finish generating all chunks in the area
Use worldborder commands to limit player movement if needed
Preload in a separate test world before using on a live server
Preload during low-traffic times
Increase server RAM and CPU allocation before large preloads
Lower view distance and simulation distance during generation
Use pregeneration commands from your server software if available
For single-player, use a chunk pregenerator mod
Keep backups before preloading large regions
Check server logs for generation errors
Stop the task if TPS drops too low and resume later