I do agree too about Cortana, there are also countless of "hidden spy" processes that can be shut down using the command prompt, you know... all those games, sports, music, tv, maps, calendar, and so on related things that eat your bandwitdh and your ram and spy your activity. A complete "How to tweak W10" guide is here
https://fdossena.com/?p=w10debotnet/index_1703.frag