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CarbonlessBeta

Carbon report

a16z.com

Scanned · all pages on a16z.com

0.058 g

cleaner than an estimated 92.8% of pages on the web 

  1. A+
  2. A
  3. B
  4. C
  5. D
  6. E
  7. F

A+ is 0.04 g or less per view, F is more than 0.359 g CO₂e.

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What the browser rendered, so you can confirm a real page was measured.

The numbers

441 kBcold load, on the wire
217 domains
8.4 kB6 requests
231 kB52% re-downloaded
0.065 g CO₂e
0.034 g CO₂e
unknown
1.08 s
0.002
282 ms

At 10,000 views a month this page emits about 6.9 kg CO₂e a year, roughly 28 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 52%, and world-average grid intensity. How we calculate this

What to fix

apply everything → ~0.044 g/visit, rating A

  1. Convert and compress imagessave ~0.0071 g/visit (54 kB)Medium impact · quick fix

    1 image (120 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.

    • bg-homepage.jpg120 kB
    WSG 2.9: Optimize media to reduce resource use
  2. Fix caching for returning visitorssave ~0.0070 g/visit (47 kB)Medium impact · quick fix

    On a repeat visit 189 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.

    • vite-core-css.cssCache-Control: public,max-age=0,must-revalidate · 76 kB
    • vite-index2.jsCache-Control: public,max-age=0,must-revalidate · 27 kB
    • vite-HomeHeroVideoPlayer.jsCache-Control: public,max-age=0,must-revalidate · 27 kB
    • vite-core.jsCache-Control: public,max-age=0,must-revalidate · 26 kB
    • vite-icomoon.ttfCache-Control: public,max-age=0,must-revalidate · 18 kB
    WSG 4.2: Optimize caching and support offline access
  3. 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.

    WSG 4.1: Use sustainable hosting
  4. Optimize web fontssave ~<0.001 g/visit (5.4 kB)Advisory · quick fix

    3 font files total 99 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.

    • vite-DomaineText-Light.woff241 kB
    • vite-DomaineSansText-Light.woff240 kB
    • vite-icomoon.ttf18 kB
    WSG 2.11: Use optimized web typography

Where the bytes are

  • Images120 kB · 1 req
  • JavaScript101 kB · 11 req
  • Fonts99 kB · 3 req
  • CSS78 kB · 4 req
  • HTML43 kB · 1 req
  • Audio / video0 B · 1 req
Ten heaviest requests
ResourceTypeWire sizeCache-Control
a16z.com/wp-content/themes/a16z/assets/images/wr25/bg-homepage.jpgimage120 kBpublic,max-age=0,must-revalidate
a16z.com/wp-content/themes/a16z/assets/compiled/vite/css/vite-core-css.cssstylesheet76 kBpublic,max-age=0,must-revalidate
a16z.com/document43 kBpublic,max-age=0,must-revalidate
a16z.com/wp-content/themes/a16z/assets/compiled/vite/assets/vite-DomaineText-Light.woff2font41 kBpublic,max-age=0,must-revalidate
a16z.com/wp-content/themes/a16z/assets/compiled/vite/assets/vite-DomaineSansText-Light.woff2font40 kBpublic,max-age=0,must-revalidate
a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-index2.jsscript27 kBpublic,max-age=0,must-revalidate
a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-HomeHeroVideoPlayer.jsscript27 kBpublic,max-age=0,must-revalidate
a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-core.jsscript26 kBpublic,max-age=0,must-revalidate
a16z.com/wp-content/themes/a16z/assets/compiled/vite/assets/vite-icomoon.ttf?a16z15font18 kBpublic,max-age=0,must-revalidate
a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-Headless.jsscript7.2 kBpublic,max-age=0,must-revalidate

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