Google's Core Web Vitals aren't just vanity metrics; they directly impact SEO and conversion. Here is how we get all greens.
LCP (Largest Contentful Paint)
The biggest killer of LCP is large hero images. In Next.js, the next/image component is your best friend, but you must use the priority prop for above-the-fold content.
Additionally, pushing your font loading to the edge and using next/font eliminates layout shifts caused by FOUT (Flash of Unstyled Text).
Dynamic Import & Code Splitting
Use next/dynamic to lazy load heavy components that aren't immediately visible (like modals or distinct footer sections). This drastically reduces the initial JavaScript bundle size, improving INP (Interaction to Next Paint).
Server-Side Caching
Leveraging the Next.js Data Cache properly ensures that static pages are served instantly from the CDN, while dynamic content is streamed. It's about finding the right balance between force-cache and no-store.