Boot Performance worse in Windows 10 vs prior. Always?

Just throwing this out:
Does ANYONE have hard data proving that Boot performance [as measured by Windows own internal monitoring, not your conjecture] with Windows 10 is BETTER than on Windows 8.1 or Windows 7 on the exact same hardware/devices and applications?

I have yet to see even ONE single example of such on systems that went to market with 8/8.1 or 7 and then were upgraded, regardless of the method [clean install, new drive, whatever, or inline "upgrade"].
I've seen some that, from the User perspective, get to a tolerable point of "its OK", but checking the actual Diags log, it ain't so....
And of course, some are downright unusable, and are best to revert to the good OS that works well.

What is your experience, and data?

[I plan to do a pass through local Best Buy and pull the logs on a bunch of Windows 10 systems on display and see what the recorded bootup and shutdown data shows]

Windows 10 boot performance is erratic at best. Most of the time seems quite random.

True.
from Diagnostics-Performance log, recent times, modern/recent Baytrail-based ultrabook:
Boot: [all were marked as Warnings or Error]:
56210ms
69934ms
89198ms
72700ms

then there is the Physics-Miracle of simultaneous Shutdown and Boot recorded - [26ms separation]
example:
Windows has started up:

Boot Duration : 69934ms

IsDegradation : false

Incident Time (UTC) : ‎2015‎-‎10‎-‎25T18:49:50.769308300Z
Windows has shutdown:

Shutdown Duration : 10199ms

IsDegradation : false

Incident Time (UTC) : ‎2015‎-‎10‎-‎25T18:49:24.459258600Z