qqp question1: Is there a significant performance difference between a MacBook Pro with 2.6 GHz i5 dual core and 2.8 GHz i7 dual core processors, both with 16 GB RAM and 512 SSD? question2: Would it be better to get a 13 inch retina display MacBook Pro with a 2.8 GHz i5 or a 3.0 GHz i7?