Canadian Bluebeer
Prince
I've just abandoned this attempt, only 200 turns in we've hit the 70% age mark already and the crisis has started! Everything takes three times as long to build but we're not getting three times the turns. Partly as 3 civs have been eliminated (2 by me lol) which pushes the counter dramatically. I think tomorrow I'll try Marathon without crises and see how that goes.
It plays a little better with crisis off. There just seems to be "something wrong" with marathon. It doesn't feel like marathon speed.
(building stuff yes, the rest? no.)