Win 7 - 64bit here, as well. Initially, I had sound stuttering, a sign of something going wrong.
I set the output=openglnb(instead of overlay. ddraw produced awful results), cycles=auto(instead of max) and core=dynamic(instead of auto, although I doubt this truly made a difference) and not only the stuttering disappeared, but I had to put the scrolling speed all the way down(with the initial settings I had to let it 3 clicks off from lowest).
It definitely helped.
I have put memory=256, as well, since I do have a great deal of memory on my PC.( in the hopes of overriding the end turn timer bug, hopefully) but this did not prevent the stuttering at all(it was the first setting I changed).