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Carbon report

speedrun.a16z.com/faq

Scanned · all pages on speedrun.a16z.com

0.179 g

cleaner than an estimated 74.6% 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

1.61 MBcold load, on the wire
485 domains
301 kB5 requests
20 kB1% re-downloaded
0.238 g CO₂e
0.0030 g CO₂e
unknown
472 ms
n/a
7 ms

At 10,000 views a month this page emits about 21.5 kg CO₂e a year, roughly 88 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 1%, and world-average grid intensity. How we calculate this

What to fix

apply everything → ~0.113 g/visit, rating B

  1. Reduce JavaScript payloadsave ~0.034 g/visit (308 kB)High impact · moderate effort

    22 scripts total 1.23 MB on the wire (4.28 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.

    • _app-96134cb456a3216c.js680 kB
    • js169 kB
    • gtm.js131 kB
    • framework-74a4a8727fd84a0c.js102 kB
    • main-c654606de7e303fa.js42 kB
    WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
  2. Audit third-party servicessave ~0.017 g/visit (150 kB)Medium impact · moderate effort

    4 third-party domains account for 301 kB (19% 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.

    • www.googletagmanager.com300 kB
    • region1.google-analytics.com550 B
    • o66518.ingest.us.sentry.io281 B
    • 0 B
    WSG 3.5: Treat third parties the same as first parties
  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.

    • carbon.txtNo carbon.txt found at the site root; publishing one is the lightest first step.
    WSG 4.1: Use sustainable hosting
  4. Optimize web fontssave ~0.0086 g/visit (77 kB)Advisory · quick fix

    6 font files total 220 kB.

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

    • 64c1c31384189284-s.p.woff237 kB
    • 3d660e1dc7b780d4-s.p.woff237 kB
    • 8eb8b7822da4764a-s.p.woff237 kB
    • dc72bb61e9fdf7fa-s.p.woff237 kB
    • c062731b6932ef63-s.p.woff236 kB
    WSG 2.11: Use optimized web typography
  5. Stop downloading the same asset twicesave ~0.0068 g/visit (61 kB)Advisory · quick fix

    9 assets were fetched more than once in a single page load (81 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.

    • 19c9db1a3af975a5.css2 downloads · 3.1 kB
    • 2130-d42dd22e6f914382.js2 downloads · 14 kB
    • companies-408112ca6b10ebfd.js2 downloads · 5.8 kB
    • demo-day-08d0896760e61014.js2 downloads · 75 kB
    • 2753-56819a94430996c9.js2 downloads · 30 kB
    WSG 3.2: Minify and remove unused code
  6. Remove references to broken resourcessave ~<0.001 g/visit (178 B)Advisory · quick fix

    1 request answered 4xx/5xx on load: transfer and connections spent on nothing, on every single visit.

    Delete or fix the references (stale asset URLs, dead third-party tags). Each one is a request the page provably does not need.

    • meHTTP 401 · 178 B
    WSG 4.4: Setup necessary error pages and redirection links

Where the bytes are

  • JavaScript1.23 MB · 22 req
  • Fonts220 kB · 6 req
  • Other80 kB · 8 req
  • CSS30 kB · 2 req
  • Data (fetch)22 kB · 9 req
  • HTML21 kB · 1 req
Ten heaviest requests
ResourceTypeWire sizeCache-Control
speedrun.a16z.com/_next/static/chunks/pages/_app-96134cb456a3216c.jsscript680 kBpublic,max-age=31536000,immutable
www.googletagmanager.com/gtag/js?id=G-3PWR1NH2Q8&cx=c&gtm=4e6852script169 kBprivate, max-age=900
www.googletagmanager.com/gtm.js?id=GTM-P3566DWTscript131 kBprivate, max-age=900
speedrun.a16z.com/_next/static/chunks/framework-74a4a8727fd84a0c.jsscript102 kBpublic,max-age=31536000,immutable
speedrun.a16z.com/_next/static/chunks/main-c654606de7e303fa.jsscript42 kBpublic,max-age=31536000,immutable
speedrun.a16z.com/_next/static/chunks/pages/demo-day-08d0896760e61014.jsscript37 kBpublic,max-age=31536000,immutable
speedrun.a16z.com/_next/static/chunks/pages/demo-day-08d0896760e61014.jsother37 kBpublic,max-age=31536000,immutable
speedrun.a16z.com/_next/static/media/64c1c31384189284-s.p.woff2font37 kBpublic,max-age=31536000,immutable
speedrun.a16z.com/_next/static/media/3d660e1dc7b780d4-s.p.woff2font37 kBpublic,max-age=31536000,immutable
speedrun.a16z.com/_next/static/media/8eb8b7822da4764a-s.p.woff2font37 kBpublic,max-age=31536000,immutable

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