But, there IS some discussion of just why combat replays sometimes run very slow on newer (perhaps XP) machines. Mine runs a bit slow and moving it to fast action makes it too extreme in the other way...so, I live with the regular combat replay.
Same with the new system. Hopefully this can be addressed if there is a final patch.
I also have a speedy new computer - one thing I've noticed is that I can no longer see the movement lines for ships! It's very disorienting and yes - I checked under empire options to make sure if it was set to show!