huggingface.co/blog

The numbers

First visit

1.29 g CO₂e

Return visit

0.011 g CO₂e

Hosting

unknown

LCP

1.18 s

CLS

0

TTFB

160 ms

At 10,000 views a month this page emits about 116.1 kg CO₂e a year, roughly 476 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 1%, and world-average grid intensity. How we calculate this

1. Convert and compress imagessave ~0.380 g/visit (3.41 MB)High impact · quick fix

   14 images (7.58 MB) ship in legacy formats (JPEG/PNG/GIF).

   Serve AVIF (or WebP) with responsive srcset sizes, and re-compress oversized files. AVIF typically halves JPEG weight at the same visual quality.

   • Cj0RZwvOSUhFGFEFKgyDw.png2.98 MB
   • 3HJgWuzAFymnAq6TqEdL7.png1.50 MB
   • thumbnail_grabette.png1.45 MB
   • thumbnail.png500 kB
   • ibA2XHLJsqDH9VAL-3ou-.png281 kB

   WSG 2.9: Optimize media to reduce resource use
2. Audit third-party servicessave ~0.031 g/visit (274 kB)High impact · moderate effort

   3 third-party domains account for 548 kB (6% 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.

   • de5282c3ca0c.edge.sdk.awswaf.com293 kB
   • js.stripe.com252 kB
   • cdnjs.cloudflare.com3.3 kB

   WSG 3.5: Treat third parties the same as first parties
3. Reduce JavaScript payloadsave ~0.021 g/visit (192 kB)High impact · moderate effort

   86 scripts total 770 kB on the wire (2.25 MB 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.

   • challenge.js290 kB
   • v3252 kB
   • index.js48 kB
   • ViewUtils-OpAoqUBd.js38 kB
   • index-client-CkQhurOl.js28 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
4. 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.

   WSG 4.1: Use sustainable hosting
5. Upgrade compression beyond gzipsave ~0.0060 g/visit (54 kB)Advisory · quick fix

   359 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.

   • challenge.js290 kB
   • blog68 kB
   • IconCaretRightCondensed-Cqvy8voX.js940 B

   WSG 4.3: Reduce data transfer with compression
6. Optimize web fontssave ~0.0043 g/visit (38 kB)Advisory · quick fix

   5 font files total 110 kB.

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

   • eebe9730-6100-405f-a29c-5a42b00bd10a.woff248 kB
   • source-sans-pro-latin-400-normal.woff215 kB
   • source-sans-pro-latin-600-normal.woff215 kB
   • source-sans-pro-latin-700-normal.woff215 kB
   • ibm-plex-mono-latin-400-normal.woff215 kB

   WSG 2.11: Use optimized web typography
7. Set a page-weight budgetAdvisory · moderate effort

   At 8.68 MB per view this page rates F. The findings above list where the weight is.

   Agree a transfer budget (e.g. under 975 kB reaches a B), enforce it in CI, and re-scan after each change to hold the line.

   WSG 3.1: Set goals based on performance and energy impact

Where the bytes are

• Images7.64 MB · 26 req
• JavaScript770 kB · 86 req
• Fonts110 kB · 5 req
• CSS87 kB · 2 req
• HTML68 kB · 2 req
• Data (fetch)2.1 kB · 2 req