I have a 2012 MacMini loaded with 16 GB of memory. However, I found it was running very slowly lately, so when a deal was advertised on a 500 GB SSD, I picked one up and installed it. I did a "clean install": no transfer of programs or settings from another Mac. I wanted to streamline the computer and toss out unused programs and files. I installed El Capitan (which seems to run fine on my MacBook Pro), then programs like Office for Mac, Lightroom, and a few others. It's far from being overloaded. BUT... the MacMini now runs slower than ever! Firefox takes forever to load, and almost seems unstable. Lightroom takes an eternity to load just one photo. Simple things like "About this Mac" and even the Finder seem unusually long to start up or sluggish. Am I missing something here? Did I forget to do something?