Important settings
- online-mode: account authentication setting. Turning it off can create security risks.
- view-distance: how far chunks are sent to players.
- simulation-distance: how far game logic is processed.
- difficulty: peaceful, easy, normal or hard.
- white-list: whether only approved players can join.
Lag and performance
If a server lags, view-distance and simulation-distance are often important. Lower values can reduce load, but very low values make gameplay feel cramped.
Use a generator carefully
A server.properties generator is useful, but always keep a backup of the old file before replacing server settings.