What’s new (regarding Web Performance) in DevTools, Chrome 124
1️⃣ Hide functions and their children in the flame chart
2️⃣ Arrows from selected initiators to events they initiated
3️⃣ Enabling JS sampling adds detailed JavaScript call stacks to the performance trace
TTFB happens before user-centric metrics such as First Contentful Paint (FCP) and Largest Contentful Paint (LCP), we recommend that your server respond to navigation requests quickly enough so that the 75th percentile of users experience an FCP within the "good" threshold. As a rough guide, most sites should strive to have a TTFB of 0.8 seconds or less.