Web development refers to the set of design, programming, and optimization techniques that allow for the creation and maintenance of websites or applications accessible via a browser. In 2024 and 2025, several technical evolutions are profoundly changing the way these projects are conducted, from writing code to the performance criteria imposed by search engines.
INP and Core Web Vitals: the responsiveness criterion that changes technical SEO
Google replaced the First Input Delay (FID) with the Interaction to Next Paint (INP) in its Core Web Vitals in March 2024. This change may seem trivial, but it radically shifts the evaluation benchmark.
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The FID only measured the latency of the user’s first interaction with the page. The INP, on the other hand, takes into account the responsiveness of all interactions during the visit: clicks, key presses, menu openings, form submissions.
In practical terms, a site could achieve a good FID score with a fast homepage on the first click, even if subsequent interactions were slow. With the INP, every interaction counts towards the overall performance score. For developers, this requires a reevaluation of the management of heavy JavaScript that blocks the main thread, especially on pages rich in dynamic components.
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Teams working on their online presence can visit www The Web Brains to understand how these technical criteria fit into a coherent web strategy.
The improvement levers are specific: break down long JavaScript tasks, defer loading of non-critical scripts, reduce DOM complexity. A site with a modern design but code that blocks the browser with every click will lose SEO ranking, regardless of the quality of its content.
AI Copilots in IDEs: beyond code completion
GitHub Copilot, JetBrains AI Assistant, and VS Code AI extensions are no longer just gadgets. Their massive adoption since late 2023 has transformed web development habits on several levels.
The most visible aspect is code completion: the developer types a few lines, and the tool suggests the continuation. But the real impact lies in project architecture. These copilots generate automatic scaffolding (basic structures of components, routes, data models), standardize design patterns within a team, and produce unit tests on the fly.
The direct consequence for a company’s online presence is a reduction in technical debt. When CSS is generated according to consistent conventions and tests cover more use cases, production bugs decrease, pages load more reliably, and user experience gains stability.
One point deserves attention: these tools do not replace the understanding of what is being built. A copilot that generates a functional React component does not guarantee that this component will be accessible, lightweight, or compliant with best SEO practices. Human review remains the essential filter.
Performance-oriented front-end architecture: what recent frameworks change
Frameworks like Astro and Svelte are gaining adoption for a concrete technical reason: they reduce the amount of JavaScript sent to the browser.
Astro, for example, applies an “islands architecture” approach. Instead of sending a complete JavaScript bundle for the entire page, only interactive components receive JavaScript. The rest is rendered as static HTML on the server side. The performance gain is directly measurable on the Core Web Vitals.
Svelte adopts a different but converging logic: the framework compiles components into minimal native JavaScript at build time, rather than embedding a heavy runtime in the browser. The result is lighter final code, which improves loading time and responsiveness of interactions.
For a showcase site, a corporate blog, or an e-commerce platform, the choice of framework has direct repercussions on SEO and conversion rates. Selection criteria should include:
- The weight of the final JavaScript bundle delivered to the browser, which directly influences the INP score and mobile loading time
- The framework’s ability to perform server-side rendering (SSR) or static site generation (SSG), both favorable approaches for search engine indexing
- Compatibility with accessibility tools and WCAG standards, often overlooked in technical comparisons
Web eco-design: a technical constraint that becomes an SEO advantage
Web eco-design involves reducing the environmental footprint of a site by optimizing its weight, server requests, and resource consumption. What is remarkable is that the best practices of eco-design almost exactly overlap with SEO performance criteria.
Compressing images, limiting unnecessary API calls, avoiding superfluous web fonts, reducing the DOM: each of these actions decreases loading time, improves responsiveness, and reduces bandwidth consumption.
Eco-design also requires questioning the truly useful features. A homepage carousel with autoplay videos weighs heavily on the network and on mobile user experience. Removing it or replacing it with a well-optimized static image simultaneously improves environmental score, SEO, and bounce rate.
Companies developing their digital marketing online have an interest in integrating this approach from the design phase. A lightweight site loads faster on mobile networks, better covers areas with low connectivity, and offers a superior user experience across all devices.
Technical choices in web development are no longer separable from online visibility strategy. A poorly chosen framework degrades SEO, poorly optimized JavaScript drops the INP score, and an overloaded site loses visitors before they even read the first line. Technical performance has become the foundation of any sustainable online presence.