Pretty much anything, from your Desktop Environment to the simplest application running in the background, will have way more of an impact than pretty much any semistatic website. I’m curious, what do you mean with “in the optimal way possible”? Are you constantly maxing out your RAM already, and if so, how?
Great synopsis!
The cool thing about GrapheneOS: It provides basically all the comforts and usability as any Android (stock) ROM minus some compatibility issues with a portion of Google Apps and services (Google Pay doesn’t and probably will never work, for example) while providing state-of-the-art security and privacy if you choose to utilize those features. A modern Pixel with up-to-date GrapheneOS, configured the right way, is literally the most secure and private smartphone you can get today.