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Windows PCs can't sleep properly, and Microsoft wants it that way
(www.spacebar.news)
This is a most excellent place for technology news and articles.
LTT had a great video on that. Basically Windows has a bug which sometimes prevents this sleep mode from working correctly and that nukes battery life. Microsoft has promised a fix, but apparently it's not resolved still. In theory it should work exactly the same as Power Nap. It sometimes does, but sometimes - not so much.
P.S. Power Nap used to be buggy as well, but Apple fixed it years ago.
Decades old bugs aren't uncommon on Microsoft products.
Thanks for the details! When Power Nap was new I didn’t have a Mac that could use it. I think it used newer Intel tech than what my Mac had at the time IIRC.