An update: I've done hours of testing. First, with DU 15.0 from El Cap. With that, I found that copy perfomance on "Restore" from one to another disk or partition, as well as "New Disk Image from a partition" is optimal.
But with DU 16.0, which is part of Sierra, performance goes does significantly (by that I mean several times slower, not just a few percentages). I wonder why that'd be. Since the copy times correlate to the differences one gets when using /dev/rdisk vs. /dev/disk, I guess this was some concious change. But why? AFAIK, it's been working well for decades using rdisk. Any ideas, anyone? I will soon blog about it, but I'd appreciate some input before I may be making a fool of myself, again ;) I might still be doing something wrong, but so far, I've done the testing on two different pairs of Macs, all connected via Thunderbolt, and I get consistent results, at least with DU 16.0. Back to more testing... Thomas
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