My iMac was becoming slower and slower to boot up, and just slower doing a lot of things. I took it to Mac Outpost where I have dealt for many years. They spent a few days doing a whole variety of diagnostics, and discovered the root of the problem. This was solved by an SSD upgrade, and the improved performance is very obvious. This machine should be good for quite a few years yet. Great job. Thanks guys. РBob S.,  from 5-Star Google Review, May 25, 2022