Kensic
Same thing here, but I didn't have another partition with ML on it. I've switched back and forth several times between ML and Mavs. Clean installs. I too am noticing much longer shutdowns, and startups now with Mavericks.
Slide023 MBA mid 2012 4GB RAM 1.8GhZ i5 dual core 128 SSD.
yea I really don't know whats going on.
I tried "repairing disk permission" and "repair disk", found this method on the macforum, and worked for some...but didn't work for me.
I have not tried the terminal sudo's that is listed in this thread.
im going to do another clean install, and crossing my fingers. before I try the terminal sudo's in this thread.