Personnally, I have much more CTD than I used to experiment with 2.6. I used to be able to play 5 or 6 battles before exit the game (being precautious, I cleared the memory after 4th battle). Even after 2 clean installations, now I have to exit and re-start after 2 battles otherwise I will systematically crash when the third one is loading. Sometimes, I have a "back to windows" issue in the middle of a battle or even when I do nothing on the campaign map, and when I come back to the game, same deal : crash, which was avoided with 2.6.
Also, I had to resolve automatically a siege battle at Pantikapaion : wanted to play this one on the field, but the loading screen just freezed when I tried, twice. Not CTD per say, I had to reset the computer.
Only copy-paste the descr_climates script to reduce lag. Playing one-turn, Armenia campaign, with all settings on low except for vegetation on high (obviously
).