I have experimented myself this changes in my way of thinking the more i play, in my last games, i realized how much i was loosing, thinking in the long term and playing long term strats, not long ago i was very picky with my city placement, trying to get all the resources in range, even when I knew in advance that they will never going to reach the 3dr hex radius ones, i was very obsessed with wonders, and now I realize that some early wonders, even the most ''glamorous'' ones they really take more than they give, for example: In the same time you build the Great library you can manage yourself to build 2 settlers, and get two new cities up and running, and that will give you more global benefits than going for the ol' GL - Philosophy - NC, yes, you will get the leadership on science for some time, but with the lack of basically everything else... Other thing that i'm doing now, that i wasn't doing before, is placing cities directly over luxuries, instead of having all of them in range and improve them later, MY GOD!! SO MUCH GOLD!!!. So for example in my current game i'm going with Assyria and my start was plenty of diamonds, instead of trying to grab all of them in the very long therm, i place my capital over one, and, i realize something important, you loose too much turns until you get a worker (staled or built by yourself) that you can make tons of gold for just placing your city in some luxury, when i got my settlers, as i was having a lack of workers (CS took years to build them and I didn't want to bother the other civs with war declarations that early), i do the same thing over other diamonds and some silver, literally swimming in cash. And for balancing parameters, i didn't bother too much on science in the beginning as I was doing before, I instead focus on expansion, getting a religion, building units and culture generation, and when i had mi little army of siege towers, i run after my dear neighbor Darius and say. Guess what mate? Your golden age has ended!!, and then I jump from last to first on science, so much books to steal!.