The only thing I can come up with regarding my finish time is that I did naturally create a few Great People other than GS, which could have slowed my progress a bit with respect to GS. I naturally created 3 GA's and 2 GE's over the course of the game, plus got a free GE from Pisa and a free GP from HS. I did not build the Louvre since I did not want to increase my GP cost with those 2 free GA's. However, I still ended up with 7 planted academies and I probably used 7-8 GS post-research labs to help speed up research (a couple of those were bought with faith), so I thought that was pretty good overall. I'm not sure how much better you could do with Korea or Babylon, but 80 turns is a lot to shave off. Otherwise, the conditions were darn near perfect in my game (river and mountain start, lots of production and growth, obtained all of the needed wonders, including the GL which gave me an early GS to plant, peaceful most of the game except for an early war that was easily dispatched, decent number of DoF's with AI civs resulting in good number of RA's, lots of CS allies all game, etc.). At the end I had 30 population, over 1000 beakers/turn, almost 200 hammers/turn and was still getting new policies at a rate of every 10 turns or less. My faith was a bit low maybe (I think it was around 65/turn), so I wasn't able to buy GS that often as they were up to 2500 faith. I'm not sure how much better I can do even with Korea or Babylon.