Altrue:
EDIT: You should also know that it takes some time to spool up a new UE4 dedicated server instance. Depending on the frequency of level changes, and the probability of requiring a new instance upon changing levels, it might get annoying for your players. Other issues are gameplay related: Say this game has some PvP component and one player is chasing another, if the lead player gets stuck 30sec because of a server start, then the chasing playing will catch up for reasons that are unrelated to the intended gameplay.
That is a very good point. Are there any ways I could make a server with no players on it use less of the computer’s resources rather than completely shutting it down?