Maybe you also believe that the Earth was flat.
Seriously, there is nothing wrong with Windows' processes and background services.
If you haven't noticed micro-stuttering, it doesn't mean it doesn't exist
Microstutter: What it is and how to fix it | PC Gamer
"There's not much you can do with games that include a framerate cap, especially if that cap is linked to physics, AI, network code, or other elements—that's generally not the 'right' way to code a game engine, but that's a different topic. You can try lowering your quality settings, in the hope of seeing less frequent dropped frames and stutter, but even that doesn't always work. The more expensive solution is to throw hardware at the problem."