If for a specified time no client is connected, the Java process is stopped. When knocking on the server port (e.g. by the ingame Multiplayer server overview), the process is resumed. The experience for the client does not change. Of course, even loaded chunks are not ticked when the ...
If you are unsure whether or not a client modification or custom client is considered a hack, please contact a staff member and supply them with a link to the modification or custom client. The staff team will then look into said modification or custom client and decide if they are acceptab...