In e-commerce, a few seconds of loading time can be enough to lose a user.
Amazon and Google studies show that one extra second of latency can reduce conversions by 7%. On mobile, users abandon a page that takes more than 3 seconds to load. In e-commerce, performance is not a technical luxury — it is a direct business lever.
Google measures experience quality via Core Web Vitals: LCP (Largest Contentful Paint) for loading, FID/INP for interactivity and CLS for visual stability. These metrics directly influence SEO and user satisfaction.
Main causes of slowness: unoptimised images, oversized JavaScript bundle, excessive client-side rendering and lack of caching. Next.js offers native solutions: optimised Image component, automatic code splitting, SSR/ISR and the App Router with Server Components.
The Next.js Image component automatically handles resizing, compression and lazy loading:
import Image from "next/image";
export function ProductImage() {
return (
<Image
src="/product.webp"
alt="Product"
width={600}
height={600}
priority
/>
);
}