Apple Event: May 7th at 7 am PT
After the newly update OS X Update 10.9.4, the shut down of my MacBook Air slows down. It will stay several seconds more than before the update. This happens every time I try to shut down my MacBook, please meet my problem.
A Safe Mode boot deletes some system caches that may help.
Startup your Mac in Safe Mode
A Safe Mode boot takes much longer than a normal boot so be patient.
Once you are in Safe Mode, click Restart from the Apple () menu.
Once your Mac has booted to the desktop, click Shut Down from the Apple () menu to test.
Why does my MacBook Air's shutting down slow down after the recent update?
