www.google.com/chrome

The numbers

First visit

0.340 g CO₂e

Return visit

0.073 g CO₂e

Hosting

verified green

LCP

1.16 s

CLS

0.54

TTFB

17 ms

At 10,000 views a month this page emits about 32.8 kg CO₂e a year, roughly 134 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 21%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.091 g/visit (933 kB)High impact · moderate effort

   11 third-party domains account for 1.87 MB (66% 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.

   • www.youtube.com1.01 MB
   • www.googletagmanager.com481 kB
   • fonts.gstatic.com250 kB
   • www.gstatic.com117 kB
   • fonts.googleapis.com5.1 kB
   • i.ytimg.com3.9 kB

   WSG 3.5: Treat third parties the same as first parties
2. Reduce JavaScript payloadsave ~0.038 g/visit (389 kB)High impact · moderate effort

   18 scripts total 1.55 MB on the wire (5.13 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.

   • base.js483 kB
   • m=root,base346 kB
   • gtm.js170 kB
   • destination156 kB
   • js155 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
3. Fix caching for returning visitorssave ~0.016 g/visit (136 kB)High impact · quick fix

   On a repeat visit 542 kB of static assets were re-downloaded instead of coming from cache.

   Serve static assets with Cache-Control: public, max-age=31536000, immutable and versioned filenames so returning visitors download almost nothing.

   • base.jsCache-Control: public, max-age=31536000 · 483 kB
   • www-player.cssCache-Control: public, max-age=31536000 · 58 kB
   • iframe_apiCache-Control: private, max-age=0 · 535 B
   • main.min.jsCache-Control: private, max-age=0 · 26 B
   • main.min.cssCache-Control: private, max-age=0 · 26 B

   WSG 4.2: Optimize caching and support offline access
4. Defer video and audioMedium impact · quick fix

   3 videos autoplay.

   Never autoload media: use preload="none" with a poster image, load players on interaction, and stream in an efficient codec (AV1/HEVC).

   • non-chrome.webm0 B

   WSG 2.9: Optimize media to reduce resource use
5. Lazy-load below-the-fold mediasave ~0.0083 g/visit (86 kB)Medium impact · quick fix

   13 below-the-fold images/iframes (171 kB) download immediately for every visitor.

   Add loading="lazy" to below-fold img and iframe elements (and keep it off the LCP image). Browsers then fetch them only when scrolling approaches.

   • kCTF5urtzoQ64 kB
   • ai-googlelens-1.webp26 kB
   • tab-sync.webp21 kB
   • ai-googlelens-2.webp19 kB
   • passwords-fill-2.webp18 kB

   WSG 2.9: Optimize media to reduce resource use
6. Collapse the redirect chainMedium impact · quick fix

   The address that was scanned goes through 2 redirects before the document is served, ending at https://www.google.com/chrome/. 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://chrome.google.com/redirects to https://www.google.com/chrome/

   WSG 4.4: Setup necessary error pages and redirection links
7. Optimize web fontssave ~0.0085 g/visit (87 kB)Advisory · quick fix

   11 font files total 250 kB.

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

   • 4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3S…47 kB
   • KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff240 kB
   • 4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3S…34 kB
   • 5aUp9-KzpRiLCAt4Unrc-xIKmCU5oLlVnmhjtg.woff224 kB
   • 5aUu9-KzpRiLCAt4Unrc-xIKmCU5qEp2iw.woff222 kB

   WSG 2.11: Use optimized web typography
8. Upgrade compression beyond gzipsave ~0.0015 g/visit (16 kB)Advisory · quick fix

   104 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.

   • chrome.google.com67 kB
   • cookienotificationbar.min.js28 kB
   • css25.1 kB
   • cookienotificationbar.min.css2.3 kB
   • GenerateIT471 B

   WSG 4.3: Reduce data transfer with compression
9. Set a page-weight budgetAdvisory · moderate effort

   At 2.81 MB per view this page rates D. 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
10. Simplify the document structureAdvisory · larger effort

    The page renders 1562 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

• JavaScript1.55 MB · 18 req
• Images620 kB · 42 req
• Fonts250 kB · 11 req
• HTML131 kB · 2 req
• CSS128 kB · 5 req
• Other109 kB · 2 req
• Data (XHR)11 kB · 9 req
• Data (fetch)5.9 kB · 22 req
• Audio / video0 B · 1 req