I have a yr old Dell laptop that thru any online window is sloowww as hell. It had win8 on it and no matter what I tried I couldn't get any online window to move with any speed and the fact I hated win8.
So I updated to win10 a couple months ago and it's soooo much better then 8.
I searched online and found out how to turn off cortana completely. Other than that no issues at all except that my browser is still slooww.
Win10 didn't take any of the Dell stuff off, it's still all there so I figured it's probably something to do with their craps for my online slowness. I have 1 gig internet speed and speed tests show it at 972 so I know it's not that.