www.cloudflare.com

The numbers

First visit

0.870 g CO₂e

Return visit

0.030 g CO₂e

Hosting

verified green

LCP

808 ms

CLS

0.009

TTFB

21 ms

At 10,000 views a month this page emits about 79.2 kg CO₂e a year, roughly 325 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 3%, and world-average grid intensity. How we calculate this

1. Defer video and audiosave ~0.374 g/visit (4.07 MB)High impact · quick fix

   5.09 MB of audio/video downloads during initial page load.

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

   • hero-background-video.mp45.09 MB

   WSG 2.9: Optimize media to reduce resource use
2. Reduce JavaScript payloadsave ~0.026 g/visit (289 kB)High impact · moderate effort

   71 scripts total 1.15 MB on the wire (3.32 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.

   • _image.Bf6pHZez.js207 kB
   • go9u167 kB
   • otBannerSdk.js113 kB
   • dropdown-menu.B4PQSlXl.js113 kB
   • _agentation-toolbar.DuKgDrBp.js90 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
3. Fix caching for returning visitorssave ~0.0073 g/visit (60 kB)Medium impact · quick fix

   On a repeat visit 242 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.

   • 21708102-7a68-4230-8ca6-b088879ce262.pngCache-Control: public, max-age=0, must-revalidate · 82 kB
   • 1e9d9fd3-c1e8-47df-a4dc-7c97d9f8b6c8.svgCache-Control: public, max-age=0, must-revalidate · 20 kB
   • duncan-davidson.pngCache-Control: public, max-age=0, must-revalidate · 8.6 kB
   • s.jsno Cache-Control header · 6.1 kB
   • 7f0c2889-d3c1-4b33-b205-e1917c22bb53.svgCache-Control: public, max-age=0, must-revalidate · 6.0 kB

   WSG 4.2: Optimize caching and support offline access
4. Stop downloading the same asset twicesave ~0.018 g/visit (197 kB)Advisory · quick fix

   2 assets were fetched more than once in a single page load (197 kB of repeated transfer).

   Usually a script injected twice or cache-busting query strings that differ per reference. Load each asset once and let the HTTP cache do its job.

   • icons.svg2 downloads · 389 kB
   • t4 downloads · 4.0 kB

   WSG 3.2: Minify and remove unused code
5. Set a page-weight budgetAdvisory · moderate effort

   At 7.19 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
6. Remove the entry redirectAdvisory · quick fix

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

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

   The page renders 3006 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

• Audio / video5.09 MB · 1 req
• JavaScript1.15 MB · 71 req
• Images448 kB · 36 req
• Other194 kB · 1 req
• HTML105 kB · 1 req
• CSS85 kB · 3 req
• Fonts76 kB · 3 req
• Data (fetch)35 kB · 7 req
• Data (XHR)3.5 kB · 2 req