Core Web Vitals measure real loading and interaction experience. Weak scores often mean slow mobile LCP, heavy scripts or layout shifts that hurt trust and conversion.
Ask for field/lab measurements before go-live, optimized images, critical CSS and a clear JS budget — without empty promises of a perfect score forever.
Mobile LCP on a slow network, INP on forms/menus, CLS on banners and fonts. Hosting and CDN matter as much as front-end craft.
For a new or redesigned site see Websites. For technical SEO and continuous improvement see Digital Marketing / SEO.