This is sitting idle with just some chopping and clean up. New game. It generally hovers in the 65% range, but peaks around 80%. In spite of this, the game seems to run fairly smoothly.
Update: Game seems to be rock solid on this machine (other than the high CPU usage). Had it running all evening (on pause for an hour or two also) and no crash (that’s never happened before). That’s certainly a treat. I’ll run it longer tomorrow and test the save game function more.