The supporter had to search several times to find a single internal knowledge record, saying that poor performance is quite possible with the target disk mode, but without stating the reason for it. ![]() In the middle of the migration process I called the Apple Support and it became clear, that the Apple supporting team was not aware of this poor performance. ![]() The whole migration process took 14 hours! This is equivalent to an average of 8.3MB/s and this not only disappointing but also ridiculous! Transfer rate was in between the range of min. I put my old MacBook pro in the Thunderbolt target disk mode and started the migration. ![]() I wanted to migrate (by Apple the migration assistant app) all my data (settings, apps, users) with about 420GB from my old MacBook pro 15" (2013) to a new MacBook Pro i9 over a Thunderbolt 2-3 connection.
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