No shutdown lag here...
I just wanted to let everyone know that I haven't seen the slow shutdown issue on my rMBP and iMac on any stages of ML. I do put a lot of load on the machines reboot rarely, creative suite with lots of PS & AE plugins, video editors, office software, 2 browsers with 10s of tabs open, a bunch of little helper programs in the menu bar, font server, ftp and afp/smb connections, email, always have a bunch of drives and other devices plugged into ports etc. I do have the facebook integration on but no icloud sync. Usually takes 4-8 sec to shut down, but I do, as a habit, always close all the applications that were running before I restart or shut down the machines. Even with all this other ballast from the screenshot it works well. Safari does struggle on videoblogs though... thx