Does anyone else notice the time needed to save the game gets very long as time goes on?
My own game is in 2074 (started 2025) and I just timed the save game function at 21.6 seconds.
I would look at the logs, especially if they are filled by allot of ground combat reports that could be a potential bottleneck. I know this will hamper turn times allot during extensive ground combat. I have seen that when I ran several long ground combat in sequence that each took a few moths to conclude, especially with lots of aircraft involved as each on make a single entry in the logs. If you have a few hundred fighters that adds up over time and ground fighters tend to be rather small as that soaks enemy AA fire allot more effectively than large fighters.
I have had zero combat (ground or space).
Also, each Jan-1 I manually delete all fleet history records (of my own race) older than 2 years.
That seemed to make a difference when I started doing it, but obviously there is something else now slowing the save down.
Actually, let me test the fleet history theory...
(hold music)
...and, maybe not so much.
My race had 14,670 fleet history records. Saving took 21.6 seconds.
After deleting all of them, saving took 20.85 seconds.
Total fleet history records for all races: 74,148.
After deleting all of them, saving took 19.31 seconds.
So it would seem that large numbers of fleet history records increases save times, but in this case it is not a major culprit.