Businesses should focus primarily on meeting or staying below the threshold of the Core Web Vitals. However, they must also keep in mind that their page load times could be affected by other metrics, such as the length of time the first purchase takes and the first contentful paint.nnFor example, to find out what contributes to a bad First Input Delay—the FID, check the total blocking time and time to interact. Those are also vitals, just not part of the Core Web Vitals. You can also customize metrics with the many robust APIs from Google.. Such metrics could prove to be invaluable in helping you identify and resolve performance issues.