My own late 2012 iMac has become excruciatingly slow. And no amounts of cleaning up is helping it. My guess is that it's because of MacOS Sierra this old machine is running.
When I try to lookup on the internet, I only see "marketing" blog posts by the makers of cleanup softwares, which simply swerve around the real solution. I want to thus hear from the DN community.
Thanks in advance, have a fine day y'all. Bilal