Where on earth is 10.8.3
this shutdown issue for pushing a year is downright disgraceful.
Cleaned up my wife's MBP late 2011 this am; and shutdown took 2.5 min.
my MBA takes about 30 seconds, even when I fresh restart at the login screen.
damn I miss 10.6.8
It is pretty embarrassing. I have a 3 year old iMac running on a hard drive that shuts down much faster than my brand new Macbook Air running on SSD. Snow Leopard is a much better operating system as well. Not a fan of the look of Mountain Lion.