Using the Samsung Spinpoint F1 1TB HDD we saw OS boot up times reduced by 33%.
A similar improvement is seen when measuring shutdown time.
Windows 8 took 8 seconds versus the 12 seconds it took an identically configured Windows 7 system.

We tested wake-up from sleep times using a standard hard disk drive.
Windows 8 shows a marked improvement here as well, however we still thought 10 seconds was too long.
We then tested Windows 8 using our SSD and the exact same 10 second window was repeated.
Using the Mozilla Kraken benchmark we compared the performance of Windows 7 using IE9 and Windows 8 with IE10.
The Metro version of IE10 was 3% faster, reducing the completion time to just 3926ms.
Update:We’ve added benchmarks for the latest versions of Firefox and Chrome on both operating systems.
Google V8 is another online window test we used.
In this case it gives a score, so the larger the number the better.
Though this time the Metro version is actually much slower, lagging behind by a 21% margin.