it freezes a bit because it auto saves the game at that point. it saves everything anew every moon tho to avoid data corruption but it can be a bit slow sometimes
https://drive.google.com/open?id=174oDxKXIShxbUaUarFeyEK-jz9kbxRjY
The problem is not unique to the save - it starts happening when I get to around 2 or 3 towns.