Performance is a feature. Faster sites rank higher, convert better, and cost less to run. On Next.js, most wins come from a handful of disciplined practices.
Optimize images with the built-in Image component, lean on server components to ship less JavaScript, and split code so users only download what they need.
Measure with real-user metrics, not just lab scores. Then fix the largest contentful paint, cumulative layout shift, and interaction latency in that order.