Yes, each era change inserts a 2 turn delay on the next proposal vote, but you should still aim to hit the info era or arrange for half the civs to hit the atomic era (i.e., you eliminate all but one civ and you hit atomic) at least 2 turns before the current proposal vote in order to ensure that the first vote after that proposal vote is the World Leader vote. If you trigger the WL threshold after that point (i.e., on the turn before the proposal vote or on the same turn as the proposal vote), you have to go through the next round of proposal voting before the WL vote will be held.
Ah right, good point. Is it actually 2 or actually 3 turns? IE if you have one turn remaining on the tech when voting is 3 turns away, you complete the tech at the beginning of the next turn, and boom you're in the atomic era with 2 turns left. Then, on the next turn it should trigger a new host vote, with 1 turn remaining, and that would be too late, right?
I'll be making sure to hit the atomic era with 3 turns remaining just in case. ;-)
So, here are some thoughts on the warpath option. (vs peaceful)
I'm debating how early to start the warpath. I'm thinking that due to how easy early-game warfare is on Warlord, and how late the AI will get universities, it may be best to go conquer the world (all except for one civ) semi-early. The problem is when?
Normally when going for CV (on this difficulty level), I'd want to research Education before Machinery, and research as many pre-reqs of Atomic Theory (or Penicillin) as possible before Printing Press, to ensure I hit the Atomic within 30 turns. (Although, this is only helpful to a certain point... if you delay hitting the atomic era too much by delaying sci theory, eventually the turn you get it is late enough that you'd have been better off targeting the second world congress vote instead and shooting for the Info Era. If that makes sense. At some point you haven't saved any time. First dilemma.
Also, given that I want to be on the warpath as well, I would normally tech Machinery before Education. So that's my second dilemna. However, since it's Warlord, I can probably get away with researching Education before Machinery, and still take over the world with cbs/xbs even if I don't get Machinery until like t125. But, is it worth waiting that long? The AI probably won't even have universities by then, and the capitals I'm capturing will hurt happiness (costing me 10% science from Rationalism) and increase cost of the next tech without contributing beakers until they come out of rebellion.
Maybe I want to just take over the world with archers/cbs... but taking out 8 civs by t100ish... that's a lot of unhappiness, so that would work best with only building one city... maybe two. But still, 9-10 cities by t100 smells like an unworkable amount of unhappiness... I'd have to slow down my rampage to wait for rebellion and courthouses at some point...
So, Machinery sounds better. But the problem is the lack of quality city attack options between Machinery and Artillery. Another option is Sci Theory -> Industrialization for gatlings. That would really only work if I leveled up some CBs to get logistics though. The AI will have weak capitals, but not *so* weak that unpromoted Gatlings are good enough on t150 to wipe out 8 civs in the 20 or so turns you'll have after Industrialization. Maybe if you bulbed some GS *immediately* after Printing Press to boost you through Industrialization. Too bad Comanche Riders is off the tech path for Diplo.
Artillery is out, because by then you're *definitely* not going to take over the world in time for the first world leader vote.
So, really, it's either start the attack run with archers and finish with cbs, annex as you go, and deal with the science delay that brings, or it's start with xbs and finish with gatlings, hoping that the cities you capture have universities and/or coliseums, etc., hoping that ideology saves you in the middle, etc.
And this doesn't even begin to cover the challenge of allying 20 CS by t200 on top of all this. I may have just talked myself out of a warpath solution on large maps...
If you're not going to win in the Atomic Era on the first vote, it's probably better to go (mostly) peaceful and win in the Info Era on the second vote.
I'll give it one try going for the warpath. If it slows down research by even 30 turns though, it's not actually faster than the peaceful option. So, I don't have high hopes. The difference between standard and large here is significant. (IMHO)