The 5 core web vitals (often referred to as the 3 main metrics with complementary, related, or updated metrics) are Largest Contentful Paint (LCP)****Interaction to Next Paint (INP)—which replaced FID in 2024—and Cumulative Layout Shift (CLS), along with supporting performance metrics First Contentful Paint (FCP) and Total Blocking Time (TBT). These metrics measure loading speed, interactivity, and visual stability, significantly impacting Google search rankings and user experience.
The Top 3 Core Web Vitals (Primary Metrics):
- Largest Contentful Paint (LCP)<</: Measures loading performance, specifically how long it takes for the largest image or text block to load (Good:
2.5 seconds).
- Interaction to Next Paint (INP)<</: Measures responsiveness and interactivity by capturing the latency of user actions (clicks, taps) throughout the page session (Good:
200 milliseconds).
- Cumulative Layout Shift (CLS)<</: Measures visual stability by calculating the amount of unexpected shifting of page content
- First Contentful Paint (FCP)<</: Measures the time from when the page starts loading to when any part of the page content is rendered on the screen.
- Total Blocking Time (TBT)<</: Measures the total amount of time a page is blocked from responding to user input, Strongly correlating with INP and FID