I feel like every since Sandy Bridge the performance in mobile CPU's has only gone up so much. I have 2 Sandy Bridge, 1 Ivy Bridge, and 1 Broadwell machine and all of them feel about the same performance wise and run flawlessly. The only slight difference between my i5 Sandy Bridge Mac Mini and my Broadwell i5 is the Broadwell is only slightly cooler. I can't justify the price point of current Macs. Used 5 year old Macs are still snappy as hell.