No idea why - I just reinstalled OS X, and TW08 used to use 100% CPU (both cores? Not sure if it is only using 1 core), but now it never goes above 50%. Any other intense application uses 100% CPU (both cores). It means that it is a bit sluggish, and if I'm doing something else while TW08 is loading the next hole, it is pretty laggy. Any ideas?