OK. So, I learned, to my dismay, that my Parallels-7 program will not operate with Mavericks. Decided to get a head start and downloaded (and PAID for) the upgrade from Parallels-7 to Parallels-9. Installed under the latest, updated version of Mountain Lion. Installation was uneventful, so I was fairly well satisfied that everything still works under Mountain Lion. However . . . . Parallels-9 is advertised as being "40% faster" than previous versions. I HAVE NOT SEEN THAT. Sadly, I did not benchmark my speeds with Parallels-7 before installing Parallels-9, but I am certain that the new system is NOT faster. In fact, I suspect is is even slower than Parallels-7. Anyone else have this experience?