www.flickr.com

The numbers

First visit

0.875 g CO₂e

Return visit

0.035 g CO₂e

Hosting

unknown

LCP

1.22 s

CLS

0.117

TTFB

130 ms

At 10,000 views a month this page emits about 79.8 kg CO₂e a year, roughly 327 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 4%, and world-average grid intensity. How we calculate this

1. Audit third-party servicessave ~0.331 g/visit (2.94 MB)High impact · moderate effort

   11 third-party domains account for 5.88 MB (100% 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.

   • combo.staticflickr.com4.34 MB
   • consent.trustarc.com509 kB
   • cdn.prod.website-files.com484 kB
   • fonts.gstatic.com274 kB
   • cdn.weglot.com139 kB
   • cmp.osano.com74 kB

   WSG 3.5: Treat third parties the same as first parties
2. Convert and compress imagessave ~0.210 g/visit (1.87 MB)High impact · quick fix

   8 images (4.15 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.

   • 6a2873658c5b2ac0e2547902_MODE%20QR%20Poster%2…3.80 MB
   • 69a0645cee32cb0091e93161_film.png315 kB
   • cookiepref.png9.5 kB
   • 66b3f60bcd82f68f2716490a_flickr%20horz%20logo…6.8 kB
   • 66a3f743c2b81576e1086ed4_flickr%20horz%20logo…6.5 kB

   WSG 2.9: Optimize media to reduce resource use
3. Serve images at the size they displaysave ~0.036 g/visit (316 kB)High impact · quick fix

   10 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.

   • 6a2873658c5b2ac0e2547902_MODE%20QR%20Poster%2…3.80 MB
   • 66a3e8ae2edf23b2ccd84da0_photo-5-hm.avif70 kB
   • 66a3e2633570cc7dff765281_photo-4-hm.avif29 kB
   • 671bc870f04a52bc3248fca9_photo-6-hm.avif29 kB
   • 66ba7f8b6ce1b219366751dd_Hero%202.avif29 kB

   WSG 2.9: Optimize media to reduce resource use
4. Reduce JavaScript payloadsave ~0.017 g/visit (149 kB)Medium impact · moderate effort

   18 scripts total 596 kB on the wire (2.06 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.

   • iab-bundle.js101 kB
   • tcfapi2.2.js84 kB
   • weglot.min.js75 kB
   • osano.js74 kB
   • index.1.10.2.js53 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
5. Optimize web fontssave ~0.015 g/visit (137 kB)Medium impact · quick fix

   14 font files total 380 kB, 2 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.

   • 4iCv6KVjbNBYlgoC1CzjsGyN.woff239 kB
   • 4iCp6KVjbNBYlgoKejZftVyPN4E.woff238 kB
   • 4iCu6KVjbNBYlgoKej70l0k.woff237 kB
   • 4iCs6KVjbNBYlgoKfw72.woff235 kB
   • 4iCp6KVjbNBYlgoKejYHtFyPN4E.woff233 kB

   WSG 2.11: Use optimized web typography
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 ~0.014 g/visit (125 kB)Advisory · quick fix

   835 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.

   • modalconfig218 kB
   • iab-bundle.js101 kB
   • tcfapi2.2.js84 kB
   • weglot.min.js75 kB
   • index.1.10.2.js53 kB

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

   At 5.90 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
9. Remove the entry redirectAdvisory · quick fix

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

   WSG 4.4: Setup necessary error pages and redirection links

Where the bytes are

• Images4.61 MB · 38 req
• JavaScript596 kB · 18 req
• Fonts380 kB · 14 req
• Data (fetch)220 kB · 4 req
• CSS50 kB · 3 req
• Data (XHR)24 kB · 1 req
• HTML16 kB · 2 req