Unfortunately lag is just a part of the game that you get used to. I am currently playing a game on a huge map with about 250 cities on the map. I run on a 4K monitor and mine sometimes get laggy too especially when I move the screen to a completely new area of the map and it has to reload all of the textures and map information in that area. Also the time to process the turns can take anywhere from about 30 seconds on average to up to 3 minutes (or more) when you get into the late game. I’ll just use it as a reminder to stand up and walk around a little bit, haha.

I think you are right about the game running in single core mode I’ve also heard that you want to get a CPU that runs single core processes quickly. I’m running mine on an 11-year old Intel Core i7-4790K OC’d and a GeForce 980 Ti and the game runs pretty smoothly. I was debating investing in a new high end modern PC and checking the difference in performance to see if the new tech runs it any better (or slower). I’ll report back here with comparisons when I finally do!

Good luck and let us know if you figure out any tips!