My 2 previous installs/upgrades of Windows 10 went almost flawlessly. My time using them still is a good experience.
I knew that I was going to hit a bump in the road.
The third time was an old ThinkPad X100e running Windows 7 Pro and it was slooooooow. Maybe Windows 10 would freshen it up.
As previously I used this procedure.
It wasn't as smooth as before.
The first time the upgrade just hung and I had to hard power down the laptop.
The second time I got error "0xc1900101 - 0x2000c" and it rolled back to Windows 7. Windows 7 was not well at that point.
I restored the X100e from a previous system image and tried again.
This time I used a USB drive version of Windows 10 Pro that I had built using this Microsoft tool.
The third time worked.
The poor old X100e limped along until it ran Windows Update a couple of times and now it's fine.
It's too early to tell if it's faster but I think not.
Incidentally I have noticed on all 3 installs/upgrades of Windows 10 that System Recovery has been turned off. Be sure and check this on your system.