I am still getting absolutely MASSIVE late-game slowdown. My pc has a 10700k cpu and a 3080 Ti. One of the cores of the cpu keeps hitting 100% load at the beginning of many months while the other cores don't generally get above 20%. I'm playing in a large galaxy in my current playthrough, and the slowdowns started getting annoyingly noticeable after I had conquered about half the galaxy, then quickly got to the point where they make the game essentially unplayable. When a new month begins, the game will often completely stop for several minutes. I can click on things (so the game hasn't completely hung), but the game doesn't register any changes (choosing a new tech, building buildings, moving fleets, etc.) until the lag spike ends several minutes later. PLEASE FIX THIS, DEVS. I really love the direction the game has taken in general, but the performance problems override anything else since they make the game unplayable (for me at least).
Edit: the lag spikes generally are worst when I finish researching a tech. Maybe because I'm just doing repeatable techs at this point that usually buff my fleets, and I have something like 22 fleets of 1 titan, 30 battleships, and 4 corvettes. I'm guessing the new tech buffing my ships might have something to do with the slowdown but not sure.
Edit: the lag spikes generally are worst when I finish researching a tech. Maybe because I'm just doing repeatable techs at this point that usually buff my fleets, and I have something like 22 fleets of 1 titan, 30 battleships, and 4 corvettes. I'm guessing the new tech buffing my ships might have something to do with the slowdown but not sure.
It wasn't like that.... 
