I just got to play a fair amount this weekend. I noticed that after 50-60 turns the turn time went from a few seconds to over a minute.
Trial and error: Huge, 8 AI + my race, mostly abundant settings
1. I tried to restart my cpu and reload...no change in turn times
2. I tried with with less mods, so a new game. The turn times were seconds until 40ish turns then over a minute.
3. I tried with no mods, so a new game. The turn times were seconds until 40ish turns then over a minute.
Going to try a smaller map with fewer AIs and see if that helps. I have never seen the game slow down so much before patch 2.2. I feel like I am playing Civ6. That is why I am trying to figure out if it is my settings or something else.