This is a small explainer that I built for a talk on web fonts and performance. […] For example, if you're rendering the main body text on a site, you should use font-display:optional.

As a matter of fact, the Time To Interactive does not measure how long it takes for a page to become interactive, it measures how long it takes to be sure, regarding the conditions, that a interactivity can happen in a satisfactory way, for at least 5 seconds.