Other Web Vitals
To satisfy your consumers' expectations in terms of speed and performance, in addition to Core Web Vitals, you'll need to track a couple more performance metrics that will provide you with accurate insights into how your pages perform.
These other Web Vitals serve as proxies or supplemental metrics for the CWV and are there to help you get a deeper understanding of loading experience, interactivity, and visual stability.
Time to first byte (TTFB) and first contentful paint (FCP) are useful metrics to track in terms of loading experience besides the largest contentful paint (LCP).
Total blocking time (TBT) and first input delay (FID) help in a better understanding of interactivity alongside interaction to next paint (INP). As of March 2024 INP replaced FID as Core Web Vital.
Cumulative Layout Shift (CLS) is the sole metric responsible for visual stability.
Time to Interactive (TTI) measures how long it takes a page to become fully interactive.
Finally, Speed Index is a performance metric that measures how quickly your page is visually complete above-the-fold.
