Core Web Vitals are metrics used to assess aspects of user experience. The key metrics commonly discussed are Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). Interpret them alongside page context and real-user data.
Key Concepts
LCP measures when the largest visible content element is rendered. Improvements may include faster server response, optimizing the main image, reducing render-blocking resources, and using caching appropriately. INP measures interaction responsiveness; heavy JavaScript can make a page feel slow.
Practical Steps
CLS measures unexpected layout movement. Set dimensions for images and videos, reserve space for ads and embeds, and avoid inserting content above what someone is reading. Use field data when available and prioritize fixes that make a meaningful difference to visitors.