Need help guys. My friend upgraded to windows 10 because of how great I said its running for me so I feel some what responsible. 
His computers running extremely slow after upgrading. I haven't seen it myself but he says everythings too slow and basically it's not usable. Some thing like this video.
https://youtu.be/b5gdtndXBM0
Has there been any bugs or reports of a issue like this and any tips that could help.

His computers running extremely slow after upgrading. I haven't seen it myself but he says everythings too slow and basically it's not usable. Some thing like this video.
https://youtu.be/b5gdtndXBM0
Has there been any bugs or reports of a issue like this and any tips that could help.