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CarbonlessBeta

Carbon report

www.usa.gov

Scanned · all pages on www.usa.gov

Redirected here by the site from usa.gov

0.160 g

cleaner than an estimated 77.7% 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

1.43 MBcold load, on the wire
5212 domains
912 kB28 requests
2.8 kB0% re-downloaded
0.213 g CO₂e
<0.001 g CO₂e
unknown
1.33 s
0.113
7 ms

At 10,000 views a month this page emits about 19.1 kg CO₂e a year, roughly 78 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 0%, and world-average grid intensity. How we calculate this

What to fix

apply everything → ~0.078 g/visit, rating A

  1. Audit third-party servicessave ~0.051 g/visit (456 kB)High impact · moderate effort

    10 third-party domains account for 912 kB (64% 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.com751 kB
    • gov1.siteintercept.qualtrics.com121 kB
    • dap.digitalgov.gov14 kB
    • gov1.qualtrics.com9.7 kB
    • siteimproveanalytics.com9.6 kB
    • znbabnroqffo1d7xq-cemgsa.gov1.siteintercept.qualtrics.com5.4 kB
    WSG 3.5: Treat third parties the same as first parties
  2. Reduce JavaScript payloadsave ~0.026 g/visit (238 kB)High impact · moderate effort

    20 scripts total 952 kB on the wire (2.85 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.

    • js162 kB
    • js157 kB
    • js157 kB
    • gtm.js144 kB
    • gtm.js130 kB
    WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
  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 ~0.0040 g/visit (36 kB)Advisory · quick fix

    5 font files total 101 kB.

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

    • Latin-Merriweather-Bold.woff222 kB
    • sourcesanspro-regular-webfont.woff221 kB
    • sourcesanspro-semibold-webfont.woff221 kB
    • sourcesanspro-bold-webfont.woff221 kB
    • sourcesanspro-italic-webfont.woff217 kB
    WSG 2.11: Use optimized web typography
  5. Remove the entry redirectAdvisory · quick fix

    The address that was scanned goes through 1 redirect before the document is served, ending at https://www.usa.gov/. 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://usa.gov/redirects to https://www.usa.gov/
    WSG 4.4: Setup necessary error pages and redirection links

Where the bytes are

  • JavaScript952 kB · 20 req
  • Images245 kB · 15 req
  • Fonts101 kB · 5 req
  • CSS93 kB · 2 req
  • Other25 kB · 1 req
  • HTML11 kB · 1 req
  • Data (XHR)8.0 kB · 5 req
  • Data (fetch)0 B · 3 req
Ten heaviest requests
ResourceTypeWire sizeCache-Control
www.usa.gov/s3/files/styles/max_1280w/public/2023-02/Homepage_Banner.png.webp?itok=J1XI6S0_image188 kBmax-age=900
www.googletagmanager.com/gtag/js?id=G-GXFTMLX26S&cx=c&gtm=4e6852script162 kBprivate, max-age=900
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4Lscript157 kBprivate, max-age=900
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e6852script157 kBprivate, max-age=900
www.googletagmanager.com/gtm.js?id=GTM-W8LW6DBscript144 kBprivate, max-age=900
www.googletagmanager.com/gtm.js?id=GTM-THHB6TNL&gtm=4e6852script130 kBprivate, max-age=900
www.usa.gov/sites/default/files/css/css_RS0lu12kxAKVlYtiIn6qpAq__BevSHCXAmcrTugppls.css?delta=1&language=en&theme=usagov&include=eJwdyUsKwCAMRdEN2WZJEjGEQKKD5wd3X-zkDs7FwZCgwpA0wZlrWMsYxwUUx61c1r5IvRf25y5rmpbJBv19o9fp8gFn6R2fstylesheet91 kBmax-age=1800
www.usa.gov/sites/default/files/js/js_3hag3aAJODDX1ulRH6YCI5FAoYy7-ZFzeqdmNBQlrds.js?scope=footer&delta=0&language=en&theme=usagov&include=eJx1i0EOwjAMBD9Emz9wQ-IPlpsYE0jsynGL2tcTUThy3JnZqEYhap1VSLyNS0PWdRgaocX7hHY6SOCiE5ah-Vay8I8W3LerYjrzpSLTF4PrDIJrZvSsApVkCf8VPFo_vlKD-KSUXQ2yOLF9knAojFEt9T3eTLuV9AYiJkrDscript59 kBmax-age=1800
gov1.siteintercept.qualtrics.com/dxjsmodule/963.c66321cb3f9f4543e3c6.chunk.js?Q_CLIENTVERSION=2.54.0&Q_CLIENTTYPE=web&Q_BRANDID=www.usa.govscript40 kBpublic, max-age=604800, s-maxage=604800
gov1.siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.54.0&Q_CLIENTTYPE=web&Q_BRANDID=cemgsascript35 kBpublic, max-age=604800, s-maxage=604800

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