WRT performance, fetch is a newer standard and still getting ironed out. Browsers have been using external scripts for years and know how to handle them efficie

WRT performance, fetch is a newer standard and still getting ironed out. Browsers have been using external scripts for years and know how to handle them efficiently. A downside to using `script` tags however, is they have to be on the page when the document is loaded, and they block the browser run loop.