Specifically, Windows 8 uses a hybrid technique intermediate between a full-on restart and the low-power hibernation state. In addition, Microsoft is speeding how fast a system will come out of hibernation by spreading the work across multiple processor cores.
"As in Windows 7, we close the user sessions, but instead of closing the kernel session, we hibernate it," Windows division president Steven Sinofsky said in a blog post yesterday. "It's faster because resuming the hibernated system session is comparatively less work than doing a full system initialization, but it's also faster because we added a new multi-phase resume capability, which is able to use all of the cores in a multi-core system in parallel."
The video Microsoft posted shows the impressive start up time.
Delivering fast boot times in Windows 8 (MSDN Blogs)
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