I just picked up my 2015 iMac 5K, and am planning to Migration Assistant my 2.5TB of stuff from my 2013 iMac to the new one, during the initial setup process, via Thunderbolt. Is there anything I should know before I go into it? Should I have Wi-Fi disabled in case it tries to migrate over Wi-Fi? How long should I expect 2.5TB to take over Thunderbolt? I know that the Migration Assistant process takes a little longer than just copying bulk data, but is it able to get close to the standard data transfer speed of Thunderbolt? And what is that? Is the Thunderbolt on the 2013 machine the same speed as the one on the 2015 machine? Thanks!