Honestly, I think the next logical question is what hardware is everyone using. The vibe I'm getting from all the threads regarding performance is just that it's CPU heavy. Not only is the game extremely complicated in terms of how many calculations it runs at any given time, but I'm also sure that most if not all of those calculations can be optimized much better than they currently are. If you want to get a real gauge for baselines we should be noting specs as well as if the game has leeway in terms of how much system resources are allocated to it or if its sharing them with the operating system and whatever else you may have running in the background. Now I'm not gonna deny it doesn't need improvements, but I also know with most games, especially ones that have been around this long, the minimum requirements might not be updated on its store page despite the game becoming more complicated with each patch. Also keep in mind this is far from the first time there have been issues following a major release. In my personal experience, the game has gotten better in some areas and worse in others. Overall I'd say late game the performance is better, but not perfect. As for my specs, they aren't what I'd call CPU bound. I have two machines with the game installed. First, and this is where I have logged the most hours, is a 2020 MacBook Pro with an M1 Pro cpu and 16GB of RAM(base model). Important to note, the game does not have an ARM native version. In order to run it on apple silicon, I use Rosetta II, a translation layer made by apple so people can run their older software during the transition period. It translates code from x86 to ARM. (If the devs read this please work on an arm native version. I would be very sad if I can no longer use the game to procrastinate.) Thats not only going to eat up some cpu cycles as it translates every intel native program I have running, but I wouldn't be surprised if theres an inherent performance hit just from translation alone. Given all that, I would say it runs in a performant enough manner for my admittedly low standards. The other machine is a gaming desktop I built during the pandemic. It has an i7 12700K (8 performance cores and 4 efficient cores for 20 threads total) and 32 gb RAM. If you care about graphics it has a 3070, but really the game is nowhere near as gpu heavy as it is on the cpu. Again, not laggy enough to bother me. Going on personal experience, and again please don't yell at me because I know it can absolutely be better optimized and in fact want it to be better optimized, but I would assume that it struggles more on older and/or lower end hardware. I would be willing to run some tests on both machines and compare results with everyone, but I can't do that right now because I have work to do.
EDIT: forgot ram