I had 8 on this laptop and updated to 10. Kept 7 on my desktop. I wasn't a fan of 8. I've not noticed a whole lotta difference between 8 and 10 except for the Bugs that Edge had. And still has at least one in that you can't get a drop down by Right Clicking on the Back & Forward arrows. There are supposed to be other advantages to 10 but I haven't gotten around to really looking into them. I'm not sure speed is affected as a lot of that has to do with the hardware. I have noticed that during Start Up it is really bogged down now and when I open the Task Manager it says the "Disk" is running at 100% for quite some time. However, I also noticed when I open Explorer that I don't see a "disk" for Windows 10 so I'm not sure where that's running from. Might be a conflict between 8 & 10 when starting up.