This is a new Mini 6,2 (2.3gHz, 4gb, 1TB, Yosemite). It has been running extremely slowly. Over the weekend I erased the disk and did a fresh install of Yosemite and my apps. It still runs extremely slowly. Almost any action, even switching apps, provokes at least moderate pinwheeling, sometimes extended (20-60 seconds) of pinwheeling, even with almost nothing open. Memory pressure shows low teens, CPU utilization extremely low. I have experience with Yosemite on my rMBP and have given it enough time that any indexing it needed to do should be long since completed. Suggestions welcome. Is it possible that there's some hardware issue? Thanks for any thoughts.