It's about seven minutes for me, too. I'll time it next time I play. I'm not sure how to reduce it, either. Installing more memory didn't help (did wonders for CivIV, though - got it down to 32.6 seconds in 1847 with 18 civs on a world map with 8432 tiles from many minutes). That's why I don't update as often anymore - it takes a lot longer. Plus, when I am doing something on the side while I wait, I tend to get into that and wait even longer before going back to my Civ game!
Which save do you want, cubsfan6506? I have 4000 BC and most (if not all) other years that the story parts begin/end at, as well as a few in between.
I'm awful with not deleting Civ saves. I checked a few weeks ago and I had almost 3000 Conquests saves approaching 1 gigabyte. And that's in addition to 1,250 vanilla saves totaling 3.37 gigabytes. Guess I know where to turn if I ever run out of space!
No further updates yet. I had a paper to write tonight, and fortunately didn't start playing Civ before I started writing it!