Personally, what bugs me the most is the constant reads and writes to the hard disk. I have 8 GB of RAM. I just have a web browser open. Windows, you don't need to do everything at this very moment.
Why can't Windows Update be as simple as this? https://tr3.cbsistatic.com/hub/i/2015/05/29/0cfbdde4-cc21-4d... https://i.imgur.com/7IWTX2q.png
Instead what I get (even with Windows 7) is a spinning wheel that says "Failure configuring Windows updates. Reverting changes...". Happens every time I want to use Windows (which is more of a reason to stay in the Linux partition tbh)