www.amazon.com

The numbers

First visit

0.411 g CO₂e

Return visit

0.062 g CO₂e

Hosting

unknown

LCP

460 ms

CLS

0.284

TTFB

142 ms

At 10,000 views a month this page emits about 38.8 kg CO₂e a year, roughly 159 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 15%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.138 g/visit (1.18 MB)High impact · moderate effort

   4 third-party domains account for 2.37 MB (85% 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.

   • m.media-amazon.com2.06 MB
   • 1c5c1ecf7303.7a63328c.eu-central-1.token.awswaf.com310 kB
   • s.amazon-adsystem.com363 B
   • 0 B

   WSG 3.5: Treat third parties the same as first parties
2. Reduce JavaScript payloadsave ~0.028 g/visit (236 kB)High impact · moderate effort

   28 scripts total 944 kB on the wire (3.40 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.js308 kB
   • 91u1iWIbVEL.js145 kB
   • 51rG04VN8cL._RC%7C71ETp2zKjHL.js,41InaEL-ZPL.…132 kB
   • 71oZ4bQq5dL._RC%7C81kCF8wuZEL.js,410X6e4fxpL.…104 kB
   • 11I0WXrZVoL._RC%7C11Y+5x+kkTL.js,51DFoGfFeXL.…73 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
3. Convert and compress imagessave ~0.030 g/visit (258 kB)Medium impact · quick fix

   60 images (573 kB) 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.

   • 91QNXrMXf+L._SR427,684_.jpg93 kB
   • 71zjOJ6jQoL._SR427,684_.jpg58 kB
   • MAbi1rCjQI9H2y0.png45 kB
   • 71V3s8f9c2L._SR427,684_.jpg38 kB
   • 61rG2qbLD-L._SX285_.jpg23 kB

   WSG 2.9: Optimize media to reduce resource use
4. Optimize web fontssave ~0.029 g/visit (252 kB)Medium impact · quick fix

   21 font files total 721 kB.

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

   • YixBCot3QJnxh4p.woff294 kB
   • -w6hwcDxlefrOYI.woff243 kB
   • NvWNxKhmDbgI1lq.woff242 kB
   • pnZF3$c0rgepEUt.woff242 kB
   • lZemoC3awOEEzLR.woff241 kB

   WSG 2.11: Use optimized web typography
5. Serve images at the size they displaysave ~0.0011 g/visit (9.5 kB)Medium impact · quick fix

   3 images are encoded at more than twice the pixels the layout shows, even accounting for this viewport's pixel density.

   Generate multiple sizes and let the browser pick with srcset/sizes; a 4000px original behind a 400px slot spends bandwidth no screen displays.

   • 91QNXrMXf+L._SR427,684_.jpg93 kB
   • 71zjOJ6jQoL._SR427,684_.jpg58 kB
   • 71V3s8f9c2L._SR427,684_.jpg38 kB

   WSG 2.9: Optimize media to reduce resource use
6. Lazy-load below-the-fold mediasave ~<0.001 g/visit (6.4 kB)Medium impact · quick fix

   20 below-the-fold images/iframes (108 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.

   • 41mcppa6HBL._SR210,210_.jpg8.8 kB
   • 41H1OoC40zL._SR210,210_.jpg7.7 kB
   • 411fbZRDCWL._SR210,210_.jpg7.7 kB
   • 41kVrH8jbsL._SR210,210_.jpg7.3 kB
   • 410kVhB-zWL._SR210,210_.jpg6.3 kB

   WSG 2.9: Optimize media to reduce resource use
7. 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
8. Upgrade compression beyond gzipsave ~0.012 g/visit (106 kB)Advisory · quick fix

   709 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.js308 kB
   • www.amazon.com253 kB
   • renderLazyLoadedStreaming113 kB
   • renderLazyLoadedStreaming23 kB
   • rhf10 kB

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

   At 2.77 MB per view this page rates E. 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. Remove the entry redirectAdvisory · quick fix

    The address that was scanned goes through 1 redirect before the document is served, ending at https://www.amazon.com/. 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://amazon.com/redirects to https://www.amazon.com/

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

    The page renders 1939 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

• JavaScript944 kB · 28 req
• Fonts721 kB · 21 req
• Images591 kB · 66 req
• HTML256 kB · 3 req
• Data (XHR)147 kB · 4 req
• CSS111 kB · 8 req
• Data (fetch)1.5 kB · 2 req