Double corn calls for early Bronze for sure. Assuming slavery, Bronze --> Pottery is very reasonable. A granary on double corn gives tremendous returns.
Teching fast on Deity mostly means controlling the maintenance. You wanna make sure you'll hit your next tech targets when you're going to settle cities. It's not a reason to expand slow. It's a reason to tweak your build orders/tech path, so as to take the maintenance hit when it's convenient. e.g. : you have 3 cities and 2 workers and Pottery and no Writing. Maybe you should go up to 5 workers right now and then to 5 cities, so that you get Writing earlier (as opposed to going to 5 cities and 2 workers and 1000 BC Writing with nothing to build but warriors).
You want to make sure to use some GPP.
And developping the capital is crucial. It means settling the first cities close by, helpers, to start developping tiles. This is a reason not to settle on the middle corn. Also, you never know how many good city spots you'll get.
Then it's Continents... The map type is so varied it's hard to know what's up in store. It very much depends on the number of neighbours and who they is.
