Thank you for your reply. My server has 2GB of memory, and it ran smoothly before the Space Age DLC was released. I will try using a server with more memory.

What did I do last:
At that time, I was on a train, and my friend was using a drone to collect data and build in VUCLNUS.

What happened:

My friend and I were playing online, and after half an hour (at 23:17), the game suddenly lagged, and movement became choppy.
I observed that the server's ...