Best buy is having one of their fire sales. on the imac with Retina 4K Display 3.0GHz Processor 1TB Storage My sister has been meaning to replace her aging 11 inch macbook air, and was wondering how slow the hard drive will be. Should she even consider running from an external SSD? She doesn't really use the portability of the air, and finds the screen too small for her liking, even going so far as to use a keyboard, mouse and monitor for her usual use. Her most demanding use case would be OCR (albeit not with the fastest software around). That tends to drive her macbook air's fan into overdrive. she's not interested in video, or games. Just writing, designing board games, and doing archival research. Thoughts?