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Eco-design

Verifiable digital sobriety: carbon budget per page, measured payload, right-sized infrastructure - not a claim, a practice.

EcoIndexscore measured per page
RGESNFrench reference framework
-30%target median payload
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Eco-design is not a badge: it is a set of technical decisions made from day one - asset weight, HTTP requests, caching, infrastructure sized to actual need. Every gain is measured, every regression detectable in CI.

Measure before and after

EcoIndex and RGESN provide a quantified reference: score per page, estimated carbon footprint, request count, transferred payload. We establish a baseline, set thresholds, and measure the impact of every release.

Asset and cache optimisation

Images converted to WebP/AVIF and resized on demand, fonts self-hosted with font-display: swap, third-party scripts deferred or removed. Cloudflare cache cuts origin load by more than 85% on high-traffic sites.

Right-sized infrastructure

BSO Kubernetes with horizontal autoscaling: pods scale up under load and shrink after the peak. No paying - and no consuming - for idle compute. Media is on S3/MinIO, served via CDN.

Why measure eco-design

Digital technology accounts for roughly 4% of global CO2 emissions, a share that continues to grow. Web eco-design acts on factors directly within our scope: page weight, request count, asset cache lifetime, infrastructure sizing.

The RGESN (French General Reference for Digital Service Eco-design, published by DINUM) covers 79 criteria across 8 themes: strategy, specifications, architecture, UX/UI, content, front end, back end, and hosting. It complements EcoIndex (an A-to-G score based on page weight, request count and DOM complexity).

Technical levers applied

Asset weight:

  • Images converted to WebP or AVIF, resized to the correct resolution via the Next.js <Image> component or a Cloudflare Images worker.
  • Fonts self-hosted (no external Google Fonts) with preload and font-display: swap to avoid FOIT.
  • CSS and JS bundle-split, tree-shaken and Brotli-compressed. No unnecessary dependencies in the client bundle.

HTTP request count:

  • Third-party scripts (analytics, ads, widgets) loaded in deferred mode or not loaded at all if consent has not been given.
  • SVG sprites or icon fonts for repeated pictograms.
  • API calls aggregated through the MUH middleware: a single round-trip between front end and backend, no client-side request waterfall.

Cache and infrastructure:

  • Cloudflare full-page cache on static routes, targeted invalidation on every publish (no global wipe).
  • BSO Kubernetes: horizontal autoscaling based on actual CPU/RAM load. Replicas shrink after traffic peaks - no sustained overconsumption.
  • Media on S3/MinIO, served via CDN with long TTL. No local filesystem on pods (stateless).

What this means for your CIO

  • EcoIndex report per URL: letter grade (A to G) plus estimated carbon footprint (gCO2e per visit), available as an audit or integrated into CI.
  • CI/CD thresholds: a build can be blocked if page weight exceeds a set threshold, exactly like a performance test.
  • Documented RGESN compliance: an audit grid filled criterion by criterion, applicable for public procurement or a corporate CSR policy.
  • Lower hosting costs: a correctly cached and right-sized site consumes less compute. Eco-design and cost control point in the same direction.