Why does Windows 10 Version 1607 take about 2.5 times as long to restart as Version 1511 does?

I have ugraded to version 1607 and I notice the restart time is 2.5 longer than version 1511. The boot time is about the same on both versions. I also did a clean install of version 1607 and the restart time was still about 2.5 times as long as version 1511.
What is going on with version 1607?

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