Unlike many others here, my experience is that the patch has rendered the game unplayably slow. Before the patch, things ran fine, at least until near the end of the game. Now, when my turn comes up, I get the next turn 'banner' in the lower right, then after about 20-30 seconds, it will select a unit to move (trying to manually select the unit does nothing). I move it - no delay on the move itself, but then there's another 20-30 second delay before it selects another unit, and clicking the 'next unit' arrow does nothing. Once the last unit has moved, there's another 20-30 second delay before the unit's info box disappears, and then there's another 15-20 second delay before "A unit needs orders" changes to "Next turn". I'm only on turn 7, and it's taken some 20 minutes.
My graphics card (ATI Radeon) driver is up to date, I've got no graphics issues, and seen no error messages. I'm not enabling any mods. The amount of time between turns seems reasonable - it's not as long as the delay before each of my unit selections. It's just that the game takes a LONG time to select units on my turn. I've also noticed that, while waiting if a unit has already moved and has an info box in the lower left corner, ALL option icons display correctly, but when I mouse over the icon, every single one shows the pop-up text for ATTACK.
As mentioned, the game ran fine before the patch. Does anyone have any explanation of this behavior? Or do I have to finally and completely return to CIV4? Thanks.