I've been leaving Task Manager open and I see that most tasks run on only one core while maxing it out at 25% while the other three cores are almost idle. This includes long waits while opening or saving large spreadsheets and copying large datasets from the Web. Where I thought the hard drive or the Web was the bottleneck, it was actually the CPU! Rather than take a ~75% hit on processor speed for most tasks, I'm thinking of going back to a dual core or even a single core. Wouldn't that be faster? (Although Excel recalculations, for example, use all four cores and are quite fast.) Except for specialized situations, wouldn't I (and most) be better off with only one or two cores? What am I missing here?