A set of improvements that I've been developing for several weeks to increase the performance of the servers is now ready and live!
With this new model, the game servers that don't have any active players will automatically turn themselves off after a while. They are set to come back online on their own when you want to access them; in that case, you will see a notification telling you that the world you have selected is currently being prepared. Once ready, you will be moved over.
If the server you were last playing on isn't loaded on your next visit, you will land in the lobby. In that case, go to re-enter the world and you will be allowed back inside after a short load time. If you are moving frequently between worlds, don't worry: there is a delay between the last player leaving and a world shutting down, so you won't be facing constant loading screens.
In rare instances, if the players are spread out over many worlds, you might get an error about a high server load. In that case, you won't be able to enter the location where you wanted to go until more resources free up; in that case, you are invited to wait it out by going somewhere with active players. I don't expect this to happen often, but it's possible.
This should greatly improve the game speed and stability compared to what we experienced in the last month or so. Most servers now have more memory available, as those that are unused at any moment completely clear the room for others.