Just to put a final word out on this topic I had raised two weeks ago: I cannot reproduce it any more. I had thought for a while that it was related to unencrypted CoreStorage-managed partitions, but even that doesn't seem to be the case. Initially, I certainly and repeatedly had very bad performance results when I tried to copy SSD-backed partitions from one Mac to another via Thunderbolt, and only with the new DU, and not when using dd on /dev/rdisk, but after testing many different scenarios ever since, with other Macs, I cannot reproduce any of this any more, not even with the MacBookPro I had originally copied from (the only config I could not reproduce was using the original two MacBook Pros, since the target Mac is now back in use by a friend, and I doesn't want me to mess with it any more).
So, my apologies for the false alert. The good thing is that no one seemed to be worried about this anway :) While doing my testing, I found about a dozen bugs in the new DU, though, and these are indeed reproducible. Have of them are UI bugs, and the others are things that used to work in the old DU and now instead report errors or simply misbehave. But I guess that's well known about the new DU and I do not have to raise any flags about that. Not only this list, anyway. Thomas
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