I hate Win10. Way slower than Win7. Our church has an i5 with 8GB. About 2 years old. Fairly fast. It's used to project powerpoint slides. (Well, it has other computers, but this is the one I get to use. Don't know if the same problem affected the other computers. Everyone I asked say they noticed Win10 is slower. None said it was faster). Sometime last year, it was decided to upgrade all the computers there from Win7 to Win10.
The PPT-PC used to take about 30s to boot. Shutdown was faster. Browse to any folder, they snap open instantly. Double click on a PPT file, and it starts playing in less than 1s.
Now, it takes about 1m to boot. Sometimes, it takes a few minutes. One time, it took nearly 2 hours, trying to update to FCU. Yes, our Internet was slow, but it didn't gave an option to defer the upgrade till later. We had to run to the office to get a laptop.
After the "upgrade", browse to any folder, they sometimes show up instantly, sometimes not. Sometimes, it'll just freeze for like 5 to 10 seconds, while something happens in the background. Double click on a PPT file, PPT now never takes less than 3s to load. To play the slideshow, it's anywhere from 5 to 20s.
We have a pastor who sometimes like insert some random song in the middle of his sermon. The congregation is supposed to sing with him. We're supposed to put the words up on screen. The songs are all already on the hard disk, indexed by the first line. So it isn't all that difficult. We used to be able to do it quite fast. With the Win10, he's sometimes done with the chorus and into the second verse before anything even shows up on the projector screen.