Hey bro, there's a bunch of common sense diagnostics you can do to determine problems. Lower your screen resolution, if performance speeds up, it's a graphics issue. Load an application, and then close it, load it again, if the second time is much much faster, then it's a storage issue.

Also take a moment to understand what Windows does to gain speed, it will pre-cache applications that are frequently run into ram to speed their performance up. From Windows 8 and up they minimalized the UI to improve rendering. These things can be implemented in Gnome/KDE as well.

But most importantly remember this, as a perfectionist, once it's configured perfectly, you'll find a reason to screw it up again to give your life meaning and fill the existential void that is our perception of living before you die. To add to your existential computer crisis, even if you're not a perfectionist, the above still applies.

I can also recommend a more holistic approach, you can decrease your glucose and caffeine consumption until your brain slows down, as this occurs, the computers performance will increase through relativity.