I found this demo showing differences in boot speed between Windows 8 and Windows 7. Ignoring the hokey music for a second, the difference in boot speed is quite dramatic on a Toshiba Satellite 300 with an Intel Core 2 Duo processor, 4GB of DDR Ram and 320GB Hard drive.
I’ll give the spoiler after the video below, but suffice to say, Windows 8 smoked Windows 7 in boot time, almost reason enough for many Windows 7 users to buy it right away. As far as I’m concerned, instant-on desktop PCs can’t come fast enough. SSDs help greatly, but we are not there yet.
While Windows 7 took 58 seconds to boot, Windows 8 took all of 20 seconds, 34% of 7’s boot time. With an SSD installed, boot times can go down even further, to between 5 and 7 seconds, as the video from Microsoft below shows. I’m salivating already.
Microsoft credits a a new fast startup mode which is a hybrid of traditional cold boot and resuming from hibernate for the improved boot times. For their technical description of the reasons for improved boot times for Windows 8, read this.