Hi My Mac Mini from 2012 with this spec: 2.5GHz Core i5 4GB 1600MHz DDR3 RAM Intel HD Graphics 4000 1024MB runs incredibly slowly these days with many glitches in graphic performance for example the mouse pointer disappearing from time to time and freezing for literally 2-3 minutes while the machine wakes from sleep and gets back to normal. What's happening? Do I just need more RAM and a fresh install? 4GB is a decent amount of RAM but a MemoryClean widget I have in my toolbar shows I never seem to have more than 200-400MB free so it's all getting eaten up somewhere. Activity Monitor looks normal. Is this Mac Mini just on the way out? It's really not stressed very hard, just internet browsing and some emulation gaming occasionally, hardly justifying a core i5 +4GB RAM frankly. Perhaps the HDD is giving up and I need to replace with a SSD to give it some new life?