I turned on my new retina iMac and immediately restored from time machine backup using the migration assistant. After it was done (14 hours later - 2.6 TB backup) I turned on the computer and ran blackmagic disk speed. I was getting 200ish write and 500ish read. The iMac is souped up - 4.0 cpu and upgraded gpu option. Also with the 3TB fusion. Would love your thoughts thanks!!!