My wife's laptop has always had those lovely features with Win10. She'll be doing normal Word stuff, some browser tabs open, and suddenly Windows decides to do something in the background, fans kick on high, even her mouse becomes sluggish. I had hoped that moving her to an SSD and 64GB(!) of memory would remove any of that, but nope, just Windows being Windows. Meanwhile, I have btop open all the time on my Linux machine, and my memory and CPU are always where I'd expect them to be (except for Snap stuff, I need to do a bit of extraction there for the rest of my normal apps).