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If you're doing a full erase-then-copy on a Power PC based system, you're going to see copy speeds of 6-8MB/s or so. Subsequent Smart Updates will be significantly faster, which is likely what you remember.
On an Intel-based Mac, you'll see 10-16MB/s or so, because their I/O subsystems are faster.
As far as "crashing your computer" is concerned, it's very hard for a user-level process like SuperDuper! to crash your computer itself. Instead, kernel-level processes (like FireWire or disk drivers, etc) do so. More details would help me help you figure out what's wrong there.
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--Dave Nanian
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