Why a Next.js Agency in Brussels Makes the Difference

A Next.js agency builds your site on a React framework that pre-renders pages and sends less JavaScript to the browser by default, which makes good Core Web Vitals easier to reach. The framework only helps when the team uses it well, so ask for measured results. A Brussels agency adds local availability and day-to-day experience with a French, Dutch and English audience.

What is Next.js?

Next.js is an open-source framework built on React and maintained by Vercel. Its own showcase lists companies such as Nike, Sonos and Zapier. It supports server-side rendering, static generation and React Server Components, and it optimises images and fonts.

A single project can mix strategies. A blog can be pre-built, a client area can be rendered on demand with live data, and a catalogue can be refreshed on a schedule. Since version 13 (2022), Next.js has offered the App Router, where pages and layouts are Server Components by default. Server Components run on the server, and the Next.js documentation notes that this reduces the JavaScript sent to the browser. The current major version is 16.

What it offers a business

• Performance potential: pre-rendered pages and less client-side JavaScript give a good base for fast loading.
• Technical SEO: HTML is available on first load, and metadata, sitemaps and structured data are straightforward to produce.
• Multilingual sites: locale routing and alternate-language tags (hreflang) are easy to set up properly.
• Flexibility: access to the whole React ecosystem and the freedom to design without a theme.
• Safe releases: each change can be reviewed on a preview deployment before it goes live.

Why the team matters as much as the framework

A Next.js site is not fast by itself. Heavy client-side components, unoptimised images, many third-party scripts and slow data fetching can make it as slow as any other site. The technology gives a good starting point, and the implementation decides the result.

An experienced team keeps interactive code to the parts that need it, manages images and fonts, avoids layout shifts, configures caching and checks Core Web Vitals on real data. It also integrates a content management system, such as Sanity or Contentful, so you can edit content without a developer.

Next.js and WordPress

WordPress runs 40.0% of all websites (W3Techs, 14 October 2026), and the 2025 HTTP Archive Web Almanac found that about 45% of WordPress sites pass Core Web Vitals on mobile. Those are averages across every kind of site. A well-built WordPress site can perform well, and a poorly built Next.js site can perform badly. We compare the two in a separate article.

Google states that its ranking systems use Core Web Vitals, but that relevant content comes first and good scores do not guarantee top rankings. Treat speed as a necessary quality, not a shortcut to position one.

Hosting on Vercel

Next.js and Vercel are developed by the same company, and Next.js features are designed to work well on Vercel. According to Vercel's documentation, its CDN has 126 points of presence in 94 cities across 51 countries, so pages are served close to visitors in Brussels, Paris or Amsterdam. Vercel's Hobby plan is limited to non-commercial use, so a business site needs a paid plan or another host.

What we build with Next.js

• Showcase sites and portfolios.
• E-commerce, for example headless with Shopify or Stripe payments.
• Web applications with authentication and dashboards.
• Client portals.
• Multilingual marketing sites in French, Dutch and English.

Why Brussels

Brussels is officially bilingual in French and Dutch, and English is common in business, so many sites here need three languages done properly. An agency based in Brussels works in those languages every day, knows the Belgian market and is available for meetings in person.

Next.js is our main technology at WCS. We test every site with Lighthouse and Core Web Vitals before launch. If you have a web project, tell us about it.