Since Fall patch - huge lag on unit selection

I've only played 2 games since the fall patch came out. The first was a immortal, huge, marathon, Pangaea and I noticed that there was a considerable delay in the move from one active unit to the next. I put this down to the normal issues of playing a huge map and struggled on.

My current game is a immortal standard marathon Pangaea and the lag in switching to the next unit has become ridiculous. So I did some timing. It's about mid game and I had 9 units to move or shoot at barbs. Here are the number of seconds it took for the game to move to the next unit:

55
13
19
27
72 :eek:
21
53
50

average time ~43 seconds.

I quit the game and checked my video card drivers and noticed there had been a recent release. Installed the new drivers, loaded up the game and went to the next turn. Still 9 things to do:

15
3
70
136 :mad:
56
5
5
72
32

average time ~44 seconds - no change but much greater variability.

Prior to the patch the switch to the next unit was almost instantaneous.

Playing on dx11 - all video options on high since the day ciV was released.

Anybody else having this problem? Anybody got any suggestions on how to speed things up? The game is unplayable with this sort of lag.