I recently did a fresh install of Mavrix and have been monitoring the console logs after each Developer Preview. DPs versions 1-3 all suffered from the same timeout that would bring shutdown to a crawl: com.apple.coreservices.appleid.authentication): Exit timeout elapsed (20 seconds). Killing However, since updating to DP4, this timeout error no longer occurs. Shutdowns have been about 5 seconds with the occasional lengthy one that I havent quite figured out. (SSD here). DP5 does the same so it appears not to be a fluke but instead an intentional coding change. No grinding, spinning wheel just a gray screen for about 5 seconds then I get powered off. This happens regardless of restoring previously opened apps/desktops or simply booting to nothing. Well, it aint Snow Leopard but this is probably as good as its going to get folks. Ill take it because I was convinced this one fell by the wayside forever. Lets hope it sticks. (I believe ML took a wrong turn here at 10.8.2?) And it might be an illusion on my part but Mavrix seems to boot faster. 4 startup items, 6 full screen apps and another 8 or so on Desktop 1 all get loaded in about 8 seconds from power-up. And my system is fully usable in about 12-15 seconds (Again, SSD here). And no we wont talk about *why* some of us reboot and just dont sleep our systems. If you have to ask you probably dont run multiple OSs so just let it go. Shutdown Horse: R.I.P.