I bought an external SSD for my 2017 iMac, found an easy to follow Youtube video and it has sped up everything on the Mac. Boot up times went from a couple minutes to around 20 seconds. Opening an app went from around 30 seconds to about 3 seconds. Everything on my mac now runs tremendously faster. It’s sad that my $1,100 machine was so slow but my $80 fix has made it enjoyable to use. I now love my machine and didnt have to open it up or take it to a repair person. Some places were quoting me $400-500 to open it up and add SSD internally but the $80 Samsung SSD took about an hour to install following the Youtube video and didn't compromise the iMac in any way. My family and I own iPhones, iPads, iWatch, an Apple TV and this was my first iMac. I was sad with the speed to say the least but next time I know to get the model with SSD.