www.lemonde.fr

The numbers

First visit

0.202 g CO₂e

Return visit

0.046 g CO₂e

Hosting

unknown

LCP

432 ms

CLS

0.006

TTFB

68 ms

At 10,000 views a month this page emits about 19.6 kg CO₂e a year, roughly 80 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 23%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.027 g/visit (227 kB)Medium impact · moderate effort

   6 third-party domains account for 453 kB (33% of the page).

   Remove services that no longer earn their place; load the rest on interaction (facades for embeds, delayed consent-gated tags). Each third party is also a privacy and performance dependency.

   • img.lemde.fr446 kB
   • applets.ebxcdn.com4.0 kB
   • creative.services.forecast.sirius.press1.9 kB
   • eus.rubiconproject.com1.2 kB
   • campaign.services.forecast.sirius.press663 B
   • cdn.amplitude.com0 B

   WSG 3.5: Treat third parties the same as first parties
2. Reduce JavaScript payloadsave ~0.0078 g/visit (65 kB)Medium impact · moderate effort

   12 scripts total 260 kB on the wire (888 kB decoded). Bundles this size usually carry a lot of unused code.

   Split bundles per route, tree-shake dependencies, and audit with a bundle analyzer or coverage profile. A 25% cut is a conservative target for bundles this size.

   • sdk.js95 kB
   • common.b79bb0759719d8ad.js41 kB
   • home_v2.2a95035188e6ed7c.js30 kB
   • ca618854ca95a48e.2273577e56e8a79f9e547c48da5f…26 kB
   • 03ea4fa719e85114.2273577e56e8a79f9e547c48da5f…26 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
3. Verify your hosting energyMedium impact · moderate effort

   This host has not published renewable energy evidence with the Green Web Foundation, so its energy source is unknown.

   Choose a provider listed in the Green Web Directory, or ask your current provider to publish evidence (and a carbon.txt). This cuts the data-center share of every single page view.

   • carbon.txtNo carbon.txt found at the site root; publishing one is the lightest first step.

   WSG 4.1: Use sustainable hosting
4. Optimize web fontssave ~0.013 g/visit (105 kB)Advisory · quick fix

   7 font files total 299 kB.

   Subset fonts to used glyphs, prefer one variable font over multiple weights, serve WOFF2 only, and consider system fonts for UI text.

   • TheAntiquaB_LT_700.2aaccac4935cf3d8.woff260 kB
   • TheAntiquaB_LT_800.a5e223e59d84d843.woff260 kB
   • MarrSansCondensed-Semibold-Web.22ed62e40765ed…41 kB
   • MarrSansCondensed-Medium-Web.133dea79c01db68e…40 kB
   • MarrSans-Medium-Web.ac7bf37b26f16e97.woff233 kB

   WSG 2.11: Use optimized web typography
5. Upgrade compression beyond gzipsave ~0.011 g/visit (92 kB)Advisory · quick fix

   610 kB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.

   Serve precompressed Brotli for static text assets (highest level, compressed at build time) and enable Brotli or zstd for dynamic responses; keep gzip only as the fallback.

   • lemonde.fr294 kB
   • sdk.js95 kB
   • home_v2.b4ccd5ae28253c8b.css51 kB
   • common.b79bb0759719d8ad.js41 kB
   • home_v2.2a95035188e6ed7c.js30 kB

   WSG 4.3: Reduce data transfer with compression
6. Remove the entry redirectAdvisory · quick fix

   The address that was scanned goes through 1 redirect before the document is served, ending at https://www.lemonde.fr/. Every hop is a full round trip on a connection that has not warmed up yet.

   Point links, sitemaps and canonical tags at the final address, and make the host redirect in one hop rather than chaining http to https to www.

   • https://lemonde.fr/redirects to https://www.lemonde.fr/

   WSG 4.4: Setup necessary error pages and redirection links
7. Simplify the document structureAdvisory · larger effort

   The page renders 7894 DOM elements, above the 1,500 guideline. Large trees cost memory and CPU on every visitor's device.

   Flatten wrapper markup, render long lists virtually or paginate, and prefer semantic elements over nested divs.

   WSG 3.6: Ensure code follows good semantic practices

Where the bytes are

• Images446 kB · 24 req
• Fonts299 kB · 7 req
• HTML296 kB · 3 req
• JavaScript260 kB · 12 req
• CSS53 kB · 2 req
• Data (fetch)4.5 kB · 5 req
• Data (XHR)3.0 kB · 1 req
• Other0 B · 2 req