Why it matters
On the web, speed is trust. Core Web Vitals sits squarely in how fast and stable a page feels, and that perception decides whether a visitor stays or leaves before the first interaction. Search engines reward the same qualities people do, so getting Core Web Vitals right tends to lift both experience and rankings at once.
In practice
In practice we treat Core Web Vitals as a measurable target, not a vibe. We baseline it on real devices and connections, set a budget the whole team agrees to, and check it on every release so a quick win never quietly regresses a few sprints later.