Core Web Vitals measure real-world user experience, focusing on loading, interactivity, and visual stability. These metrics help search engines assess whether pages deliver acceptable experiences.

Largest Contentful Paint (LCP) measures loading performance. Pages should display primary content quickly to reassure users. Poor LCP often results from slow servers, large images, or heavy scripts.

Interaction to Next Paint (INP) evaluates responsiveness. Delays between user input and page response create frustration and reduce engagement. Optimizing JavaScript execution improves this metric.

Cumulative Layout Shift (CLS) measures visual stability. Unexpected layout changes disrupt usability and harm trust. Reserving space for images and ads prevents these shifts.

Core Web Vitals are not standalone ranking boosters, but they act as tie-breakers in competitive results. Consistently meeting thresholds supports rankings, engagement, and conversions.