TLDR
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I'm sorry but I cannot confirm this.7) Its the fastest OS built - ( my computer boots in 3,5 seconds with SSD in Raid 0 )
My mom had a 2006-ish laptop with Intel Celeron 1,8-ish GHz, 2 GB of RAM. It ran Windows 7. Well, Windows 7 was already quite slow but once it finished booting, it was okay to "work" with (work as in Solitaire and Facebook using Chrome).
She upgraded to Windows 10 and it was sooooooo slow. Took like 6 Minutes to boot up and starting stuff like Chrome took forever.
Now her harddisk died so she went for a new laptop. It's some HP Pavillon with Core i3, 4 GB RAM and Windows 10 pre-installed. Takes maybe 3 minutes (but still!) to boot and is still slow as hell when trying to start pretty much anything.
Not everyone has a power house, and for those who don't, it's just slow.
Besides, the much-hated Windows 8 had a much faster boot-up time than Windows 7 too. Even on slower hardware.
I guess, all in all, if you have some decent hardware, Windows 10 might not be the worst release ever. But it isn't "the upgrade we've all been waiting for" either.