A few months ago I bought a new iMac. It has 16GB of RAM, a 1TB Fusion Drive, is a 21.5" Retina model, and has a 3.1GHz Intel Core i5. It has Intel Iris Pro Graphics 6200 15.36MB. The issue is it runs VERY slow. At first I thought it was my imagination. It's a secondary Mac. My primary computer is a MacBook Pro with a Core i7, 16GB, and 1TB SSD Drive. I thought a Core i5 and Fusion Drive are maybe just much slower than a Core i7 and SSD Drive. A couple months ago though I used a friend's 7 year old MacBook Pro with 8GB and a standard drive and much slower processor to realize that it was faster than my iMac and this was with multiple windows open. For example I have opened Safari on the iMac with nothing else open and tried to simply watch a video on a news site and it kept stuttering and beachballing. I was going to do something about it at the time but I knew Sierra was coming out in the near future. I thought maybe something was just quirky in the system and a update to a new OS may fix it so I put up with it being slow since it was a second computer but no such luck. It's as slow as ever. Does anyone know what could be causing this? Since it's always been like this I wonder if it's some type of hardware problem with maybe the Fusion drive or possibly the memory or even CPU. If necessary I'm glad to make an appointment and go into the Genius Bar and it would be under warranty. Yet if it's something simple I can diagnose and fix with time at home I would rather do that. Is there any type of speed test or diagnostics I should do on it? I have some background apps running but it's not as many as I have on my MacBook Pro. I just wondered if something is using up resources and causing the speed to be slow. Yet boot up also takes a long time so it's not just while it's running. Thanks for any advice or ideas.