this issue can be observed on the ME and SE Server. Yes it is required to restart both servers at a time, but when a lot of players are active and creating, building, changing sooner or later the memory usage explodes.
So the main question now is, how to address this issue to Keen.
What is causing this immense memory waste. My question now is, is it a valid consideration to move the game data, which to a database during Development or for a future release?
Even if the game uses a mysql data as requirements?
the sandbox files also expand the more players are active or playing at some point, which end up in big loading times.
special case is ME: The more the players build, create, the bigger the world file becomes.