I have this exact same behaviour under the latest version of ML.Around 20 seconds on average with maybe every fifth shut down being around 1 second. Was always around 1 second a couple of months back on Lion - the slow shut downs happened after the last update to Lion and have been there every since in some form or another.
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Slow Shut Down Times
- Thread starter ugp
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I have this exact same behaviour under the latest version of ML.Around 20 seconds on average with maybe every fifth shut down being around 1 second. Was always around 1 second a couple of months back on Lion - the slow shut downs happened after the last update to Lion and have been there every since in some form or another.
If you're referring to the maintenance scripts that run daily, weekly and monthly, those are scheduled to run at specific times, or, if a Mac is sleeping at the scheduled time, they run the next time it's running. They don't run at shutdown. My guess would be a process that is hung up or busy.
Interesting. I'm assuming that has to do with Google Keystone...I like Chrome, but every time I uninstall it things are better.
Others have reported this as well, but it ends up being temporary. Do you still have a fast shutdown time, or did it revert back to the longer shutdown time?
Definitive fix: delete System caches
Open Terminal and write these commands, each one in a different command line. You 'll need your password.
sudo chown root:admin /
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
You can find the original thread here: https://forums.macrumors.com/threads/1448304/
Agree. Tried same, but it just came back again. Still seeing a fast shutdown ever so often and confused as to why not always.
getting rid of chrome worked for me too 
getting closer and closer to an air as quick as my old SL one!
getting closer and closer to an air as quick as my old SL one!so its for sure been a recent update software issue that all of a sudden caused slow shut downs??
all i know s my rMBP was 1-2 sec shutdown, after a recent update, it is 20-30 seconds.
all i know s my rMBP was 1-2 sec shutdown, after a recent update, it is 20-30 seconds.
I have no open apps and still same issue. What have you shut down that have helped ?
Safari is the only one that I have not shut down in dock.
Edit: Shut down "Pages" that I forgot to shut, and shutdown took 5 seconds. Second time it went up to 15 seconds for shut down, and third time back up to 20 seconds. So this did not work for me. Shut down Pages again along with Safari from dock and still 20 second shut down.
Edit 2: OK, I have now removed from the Dock "Mission Control" and my shut down twice has been 3 seconds. Will try again.
Edit 3 & last time: Shut down 3 seconds again for the third time with Mission Control removed from the Dock, but the fourth time it took 10 seconds. All over the map again after a few start ups and shut downs. Not going to bother anymore until Apple comes up with a fix. Software glitch is the likely issue with OS X 10.8.2
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Sometimes if you frequently restart mac it will restart faster, but a after couple of days it seems it's back to 20 seconds. I would say there is nothing we can do about it. Maybe it's a feature where it writes RAM to HDD/SSD but I still don't get it why it's so slow.
I was having the same issue running 10.8.2 on the 2011 MacBook Air. I think the culprit is having location services and the Find My Mac service enabled. I did a clean install and unchecked those options and I have not had any shutdown issues since even after restoring all the applications I use - thus I have a good feeling it's not due to any third party software as suggested in this thread.
Worked first time with 4 second shut down...
Second time, and back to 20 second shutdown time.
I followed this from the Apple Discussions forum in your first link and it worked fine for me - set the timeout to 1 second for that plist and now back to pretty much instant shut downs!
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Slow shutdown
Certainly worked for me. Shutdown was 25-30 secs after installing ML. Now it's pretty well instantaneous. Thanks for a great tip.
Certainly worked for me. Shutdown was 25-30 secs after installing ML. Now it's pretty well instantaneous. Thanks for a great tip.
Deleted the java file, and guess what...instant shut down. Great work! Was previously taking about 25-30 seconds to do so
Page 1 for the tip. .
Mac Mini late 2012, i7 2.6, 256GB SSD
Page 1 for the tip. .
Mac Mini late 2012, i7 2.6, 256GB SSD
I tried this, didn't really do anything to shorten the slow shut down time.