Mid-2012 MapPro, OS 10.9.5, 32GM RAM, 2TB SSD and 3 2TB HD’s, all cloned to the SSD. Runs lickety-split in Mavericks: instant opening of apps, no typing lag, in short, is the fastest Mac I have ever had, and I have had dozens since 1984..
However, my efforts to upgrade to Yosemite and/or El...