Hi, I have two computers at my office: - iMac Retina 5K, 27-inch, Late 2015. 3.2 GHz Intel Core i5. 8 GB 1867 MHz DDR 3. - Macbook Retina, 12-inch, Early 2016. 1.2 GHz Intel Core m5. 8 GB 1867 MHz LPDDR3. What seems strange to me, is the iMac performance. I experience lots of small delays when doing really basic stuff in Google Chrome, Adobe Photoshop and Fantastical 2, and several times a day get the spinning mouse cursor and have to wait for several seconds before continuing. I have had quite a few iMacs over last years, and never seen this before. And the MacBook works like a beauty doing the same stuff. Any ideas? I've tried to reinstall MacOS, new user accounts++, but the issue(s) remain. Hardware issue, maybe?