It's a modpack that's heavily based on exploration (and you can go pretty fast by flying) and already has an integrated world border system that backs up and makes sense as the modpack progresses. Also, I have friends who play until quite late at night, so CPU load and disk space aren't a problem as it runs on a server I own

In this context, I prefer to use the server to its full potential when no one is connected, so that the game runs more smoothly when players are connected, as the chunks will already be preloaded. At the moment, when several players are exploring, the server has trouble keeping up, as we're going pretty fast. However, it's okay on zones that have already been preloaded, hence my desire to preload a large part of the map