So, I started a game this morning, and after a pretty long marathon, got to year 2056. Everything was running pretty smoothly right until I met the first NPR, but the slight increase in loading times was pretty similar to what I remember from playing version 1. 12. After a few more years, they started getting worryingly long, even getting to the point where Windows said "not responding" twice, but it always fixed itself after a few seconds.
Then, I took an especially long while to design 4 ships (I think I spent like an hour without passing any time doing research and trying to understand all the mechanics). After I finished, I set 4 of my shipyards to build a few of those ships, and as soon as I hit the 30 day button, it froze (I know I should have used a shorter increment, but still). I thought it could be like before, and fix itself in a bit, but I've been waiting for an hour and it's still frozen.
I checked the task manager, and it's using only a quarter of my CPU and a negligible amount of RAM (it's an intel core i5-9400F 2. 90GHz with 16Gb of RAM, in case it's important).
Does anyone know what may have caused this? I know NPRs can slow the game quite a bit, but I had gotten much further into a game and started wars with NPRs in 1. 12, and going from being able to play almost completely smoothly to freezing in a few years is quite strange.
Thank you for the help, in advance!