It may take a lot longer than that, since the browser is parsing as it goes. A SCRIPT tag in the HEAD will run synchronously, blocking parsing of the page and delaying initial render. For a tiny script that defers work, this is not a problem. But you want to schedule the stylesheet to load ASAP, in case it is cached, so it&#x27;s actually potentially a human-noticeable difference to get that function on the queue before the BODY begins parsing.