I had a similar problem a few months back running PB on a Mac. Here's the thread. It was suggested early on that I had a hard drive problem. The drive crashed twice and was rebuilt twice. Before each crash PB would slow down as you described. The Mac worked until the third crash where the drive actually died. The process lasted 3 weeks, start to finish.I now run PB on a PC and a Netbook and haven't had a single issue.The point is, Mac aside, you may have hit on an upcoming hardware issue that you're not even aware is creeping up. PB is very file system intensive and really gives the disc a workout.A good disc diagnostic might be in order.
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