[Twan]

I think most people stop big SP games once they are first by far in the charts. I think in 3 years of dom 2 I may have fully finished 3 big games, all others I've stopped around turn 100 seeing I was by large first in everything.

In Dom 3 it's the same, once you have 2/3 of the map and 3 times the research capacity of the first AI, why continue ? (all agressive AI are probably dead, and the others are not going to do anything against a stronger nation). At this point if you want a fast and official victory I imagine you may have it by building temples on all your provinces then clicking end turn until ascension.