Since 2006, I have regularly upgraded the OS and used Migration Assistant with every upgrade. Currently using the previous OS version. Now on to a 2016 MB Pro. Any thoughts as to why I should not use Migration assistant? So much time wasted if I do not use it. Possible option: 1. Use Migration assistant. 2. Then on new computer cleanup auto start apps. CPU cycles restored, SSD still used by "useless" apps. I do have a lot of Apps installed that I do not use now, including I think I installed something once which allowed me to install Unix apps etc. But my 2009 MB Pro works fine - I am sure it runs some extra CPU cycles. Thanks for weighing in!