In my most recent game the turn times went from 20-30s per turn to 4 to 5 minutes per turn in less then 10 turns. I know the game slows as the number of units and cities rise but was not expecting it to get that much slower in so few turns. Also the AI are slow launch attacks(i was at war with 6 AI's at the same time and saw a total of 4 horsemen attack during the last war. Some of the AI's do not expand despite having great oppertuneties to do so, the mongols are the worse they have only 3 cities and a fort south of those next to a river on the coast but have not created a city there despite it being a great spot for it. Other AI's do expand and some are still ahead of me in score, army size, and research(i am at ancient ballistics, they are 4-5 techs into the next age). The AI's have 100.000+ gold at times so my main source of income is selling tech to them as even the minor AI with single cities are rich. I added a save game(updated yesterday with the svn) hopefully that can help improve the AI and or turn times.