I would blame Windows Vista. Aside from a couple people in this thread I've never heard anything good about vista. Many computer vendors are stocking their PC's with XP again because Vista has been such a failure.
Civ4 also has a memory leak. If you're running vista with 1gig memory that's probably causing you serious problems. I know on my 2nd PC I need to reboot Civ occasionally clear up the horrible performance during late game.
@ the guy who said between turns are only using CPU power. I would say that's not true. The CPU has to access memory to make calculations. If your memory is unavailable and it's trying to use Virtual Memory you're talking major performance losses. Since you're running Win Vista with only 1 gig of ram, your memory shortage is likely a major culprit.
Civ4 also has a memory leak. If you're running vista with 1gig memory that's probably causing you serious problems. I know on my 2nd PC I need to reboot Civ occasionally clear up the horrible performance during late game.
@ the guy who said between turns are only using CPU power. I would say that's not true. The CPU has to access memory to make calculations. If your memory is unavailable and it's trying to use Virtual Memory you're talking major performance losses. Since you're running Win Vista with only 1 gig of ram, your memory shortage is likely a major culprit.