Agreed. The era score is quite challenging with faster speeds, especially online speed.
I also prefer to wait for conquests until mid game with online speed, as I believe it is more conducive to a build out model than an early war model. I always seem to get ripped to shreds when I approach an AI city that produces an archer every other turn. I suppose I could create 20 archers and rush the civ, but then I’d have a bunch of archer units I really don’t want.
I choose instead to build until I reach at least the mid game, then train 4 or 5 knights in an armory (+25% experience for stable, +25% for armory). I’ll often buy the armory to expedite as online moves quick! By then, for whatever the reason, the AI doesn’t usually have all that many units anyway.
The trick with the mid game armory trained knights (or late mid game military academy trained knight corps) is they promote at the drop of a hat. I think the online experience accumulation is also double speed. It’s almost like having a Mamluk. They seem to promote every 3rd turn.
I find this works exceptionally well with Shaka due to early arrival of corps.