Find (and remove) all non-Apple fonts
This is a great tip to find and remove all fonts that may not be as relevant for you. (In case scrolling a live preview of all fonts lags your computer.)
Essentially you setup a separate machine, a virtual machine or on an external disk. Then you go to Library/Fonts and label all fonts with a color, and copy these fonts to your main machine replacing all fonts, thus making all Apple fonts color labeled.
Sort by color label and you instantly see all fonts not installed by Apple.