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Couldn't care less. When I shut down my iMac (which is rare) I walk away from my desk, not sit there watching it shutting down with a stopwatch. With my MBA I just close the lid.

They will just go into sleep mode automatically.
 
When you need boot camp to boot into different operating systems, the shutdown lag was really annoying with Mountain lion, and was extremely noticeable with SSD systems, maybe not so much if you had a spinning disk drive. Apple has known about that problem since 10.8.2 but only got around to fixing it in 10.8.5. At first, even Mavericks betas had the shutdown problem, but around Beta five they finally managed to get it right. Fairly happy with Mavericks in this regard it shuts down in a reasonable time.
 
When you need boot camp to boot into different operating systems, the shutdown lag was really annoying with Mountain lion, and was extremely noticeable with SSD systems, maybe not so much if you had a spinning disk drive. Apple has known about that problem since 10.8.2 but only got around to fixing it in 10.8.5. At first, even Mavericks betas had the shutdown problem, but around Beta five they finally managed to get it right. Fairly happy with Mavericks in this regard it shuts down in a reasonable time.

I don't know if it was fixed with 10.8.5. Somewhere in between 10.8.x and 10.7.x it got so bad that I kinda stopped caring. 10.9 is back to being super fast again. Fast shutdown and fast sleep has returned.

Furthermore, one of the 10.8.x updates caused graphical anomalies during boot and shutdown. That's fixed too.
 
Couldn't care less. When I shut down my iMac (which is rare) I walk away from my desk, not sit there watching it shutting down with a stopwatch. With my MBA I just close the lid.

They will just go into sleep mode automatically.

But it's not just shutdown that is affected, it's restart as well. The problem seems to be fixed in Mavericks, but waiting 20 seconds for a restart as opposed to 3-5 seconds is what gets annoying.
 
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