Sometimes the game doesn't require much CPU to run, but other times the game struggles very badly. I've found that a problem happens when I'm looking from one map/zone into another map/zone. The game then takes up all of my computer's CPU, the frame rate drops very badly (to less than 1 fps). It comes back once I'm no longer looking at a map from a different map.
Bad areas include going from the plaza into the library end of Hydlaa, looking into the tavern from outside the tavern, looking inside the temple from outside the temple (or looking outside the temple from inside the temple), and others.
Anyone have a clue what's going on here?