There is a correlation between event performance in heat and in altitude. All the events that benefit in heat, sprints, jumps, throws (I would imagine), are the altitude-assisted ones. The distances, of course, suffer. Middle distance, at least 800 and 1500, don't seem to be affected at all. So maybe Paris will be a Mexico City repeat, with great sprinting and jumping and then tactical distances (which are good in their own right). I'll take that.