i think its a programming error,
i have a very powerful laptop which handled the original Sins with 8 players and fully maxed fleets no problem.
now with entrenchment, i zoom into a system full of mines with NO ships, and my comp slows down, sometimes even causes Sins to crash... though then again, Sins entrenchment can and will crash whenever it wants to regardless of what im doing, sometimes it take an hour, sometimes i dont get past the first loading screen...
but im 100% sure it has to be a programming problem, the number of people with the problem and the clockwork nature of the problem indicates as such