Something I've forgot to mention:
I have an older Mac: 2.66 Ghz Quad Core Intel Xeon, 6GB Ram, MacOs 10.6.8
I've also installed my CS6 package on that Mac, and Indesign works there wonderfully - No crashes; no hangs, files open up quickly, preflight is running smoothly, moving from Indesign to another application and back to Indesign does not create any hangs - It's another world.
And another thing: I've made a Package Folder from one of my Indesign files and copied the package folder to my primary ssd hardrive. Then opened the indesign file from there. Same behavior, nothing changed.
David