www.ebay.com

The numbers

First visit

0.600 g CO₂e

Return visit

0.035 g CO₂e

Hosting

unknown

LCP

1.53 s

CLS

0.004

TTFB

299 ms

At 10,000 views a month this page emits about 55.0 kg CO₂e a year, roughly 225 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 6%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.189 g/visit (1.67 MB)High impact · moderate effort

   5 third-party domains account for 3.34 MB (83% 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.

   • i.ebayimg.com2.41 MB
   • ir.ebaystatic.com899 kB
   • fonts.gstatic.com27 kB
   • cas.avalon.perfdrive.com1.4 kB
   • 0 B

   WSG 3.5: Treat third parties the same as first parties
2. Serve images at the size they displaysave ~0.095 g/visit (843 kB)High impact · quick fix

   14 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.

   • s-l960.webp257 kB
   • s-l960.webp154 kB
   • s-l960.webp152 kB
   • s-l960.webp142 kB
   • s-l960.webp141 kB

   WSG 2.9: Optimize media to reduce resource use
3. Reduce JavaScript payloadsave ~0.035 g/visit (305 kB)High impact · moderate effort

   31 scripts total 1.22 MB on the wire (4.95 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.

   • _CnsXNfLh.js334 kB
   • ifh-vendor4c2692ee9a2a662a8af1.js289 kB
   • EPMXQR178 kB
   • ifh542710c4e5d8f38461f9.js78 kB
   • radware_stormcaster_v24.js67 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
4. Lazy-load below-the-fold mediasave ~0.026 g/visit (234 kB)Medium impact · quick fix

   20 below-the-fold images/iframes (468 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.

   • s-l500.webp52 kB
   • s-l500.webp46 kB
   • s-l500.webp44 kB
   • s-l500.webp37 kB
   • s-l500.webp32 kB

   WSG 2.9: Optimize media to reduce resource use
5. Fix caching for returning visitorssave ~0.0031 g/visit (21 kB)Medium impact · quick fix

   On a repeat visit 84 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.

   • s-l960.webpCache-Control: public,max-age=31536000,immutable · 47 kB
   • ac-080526234930.dweb.min.jsCache-Control: public, max-age=30986493 · 26 kB
   • inflowcomponentCache-Control: public, no-cache · 8.6 kB
   • 9Cache-Control: max-age=0, no-cache, no-store · 994 B
   • rtmCache-Control: no-cache, no-store, must-revalidate · 989 B

   WSG 4.2: Optimize caching and support offline access
6. 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
7. Upgrade compression beyond gzipsave ~0.0089 g/visit (78 kB)Advisory · quick fix

   522 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.

   • ifh-vendor4c2692ee9a2a662a8af1.js289 kB
   • ebay.com90 kB
   • ifh542710c4e5d8f38461f9.js78 kB
   • useracquisition44 kB
   • inflowcomponent10 kB

   WSG 4.3: Reduce data transfer with compression
8. Optimize web fontssave ~<0.001 g/visit (8.0 kB)Advisory · quick fix

   3 font files total 78 kB, 1 not in WOFF2.

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

   • KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNW…27 kB
   • MarketSans-Bold-WebS.woff226 kB
   • MarketSans-Regular-WebS.woff226 kB

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

   At 4.05 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
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.ebay.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://ebay.com/redirects to https://www.ebay.com/

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

    The page renders 2550 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

• Images2.50 MB · 51 req
• JavaScript1.22 MB · 31 req
• HTML98 kB · 3 req
• CSS96 kB · 2 req
• Fonts78 kB · 3 req
• Data (XHR)48 kB · 7 req
• Data (fetch)2.9 kB · 3 req