[winkeltripel]

I've found that windows benefits from being reinstalled every once in a while. Try a fresh install of Windows 10, and see where that gets you?

[fhood]

I suspect you are right, but I really, really, don't want to take the time to do that.

[Shikadi]

Windows 10 has a nice feature to "refresh" which supposedly re-installs Windows while keeping programs and settings. I haven't tried it, so no idea how well it works, but it might be worth your time