0.263 g
cleaner than an estimated 62.1% of pages on the web
- A+
- A
- B
- C
- D
- E
- F
A+ is 0.04 g or less per view, F is more than 0.359 g CO₂e.
The numbers
- 0.350 g CO₂e
- 0.0046 g CO₂e
- unknown
- 528 ms
- 0.106
- 7 ms
At 10,000 views a month this page emits about 31.6 kg CO₂e a year, roughly 129 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 → ~0.143 g/visit, rating B
Convert and compress imagessave ~0.084 g/visit (748 kB)High impact · quick fix
514 images (1.66 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.
- c663677b-small.jpg7.6 kB
- 319f2597-small.jpg7.4 kB
- de493100-small.jpg7.3 kB
- c3202e5a-small.jpg7.2 kB
- 0934a4d8-small.jpg7.1 kB
Audit third-party servicessave ~0.016 g/visit (146 kB)Medium impact · moderate effort
7 third-party domains account for 292 kB (12% 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.com170 kB
- d3js.org90 kB
- fonts.gstatic.com17 kB
- f.convertkit.com14 kB
- fonts.googleapis.com938 B
- region1.google-analytics.com0 B
Reduce JavaScript payloadsave ~0.012 g/visit (103 kB)Medium impact · moderate effort
15 scripts total 414 kB on the wire (1.30 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.
- js170 kB
- d3.v6.min.js90 kB
- 4bd1b696-100b9d70ed4e49c1.js52 kB
- 1255-ad409e5887c155b0.js43 kB
- chart.js16 kB
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.
Optimize web fontssave ~0.0064 g/visit (58 kB)Advisory · quick fix
4 font files total 165 kB.
Subset fonts to used glyphs, prefer one variable font over multiple weights, serve WOFF2 only, and consider system fonts for UI text.
- CenturyGothic-Regular.woff268 kB
- CenturyGothic-Bold.woff262 kB
- TM.woff218 kB
- i7dPIFZifjKcF5UAWdDRYEF8RQ.woff217 kB
Upgrade compression beyond gzipsave ~0.0029 g/visit (26 kB)Advisory · quick fix
170 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.
- d3.v6.min.js90 kB
- deepseek-v4-flash-073129 kB
- ck.5.js14 kB
- arcprize.org9.3 kB
- donate8.6 kB
Remove references to broken resourcessave ~<0.001 g/visit (874 B)Advisory · quick fix
2 requests 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.
- gamesHTTP 401 · 273 B
- userHTTP 401 · 601 B
Set a page-weight budgetAdvisory · moderate effort
At 2.36 MB per view this page rates D. 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.
Simplify the document structureAdvisory · larger effort
The page renders 7250 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.
Where the bytes are
- Images1.68 MB · 522 req
- JavaScript414 kB · 15 req
- Fonts165 kB · 4 req
- Data (fetch)47 kB · 19 req
- HTML29 kB · 1 req
- CSS28 kB · 3 req
- Other0 B · 2 req
Ten heaviest requests
| Resource | Type | Wire size | Cache-Control |
|---|---|---|---|
| www.googletagmanager.com/gtag/js?id=G-B2QZ9P2362 | script | 170 kB | private, max-age=900 |
| d3js.org/d3.v6.min.js | script | 90 kB | max-age=14400 |
| arcprize.org/media/fonts/CenturyGothic-Regular.woff2 | font | 68 kB | max-age=5, stale-while-revalidate |
| arcprize.org/media/fonts/CenturyGothic-Bold.woff2 | font | 62 kB | max-age=5, stale-while-revalidate |
| arcprize.org/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js | script | 52 kB | public, max-age=31536000, immutable |
| arcprize.org/_next/static/chunks/1255-ad409e5887c155b0.js | script | 43 kB | public, max-age=31536000, immutable |
| arcprize.org/results/deepseek-v4-flash-0731 | document | 29 kB | s-maxage=31536000 |
| arcprize.org/_next/static/css/656087f650232c20.css | stylesheet | 22 kB | public, max-age=31536000, immutable |
| arcprize.org/media/fonts/TM.woff2 | font | 18 kB | max-age=5, stale-while-revalidate |
| fonts.gstatic.com/s/spacemono/v17/i7dPIFZifjKcF5UAWdDRYEF8RQ.woff2 | font | 17 kB | public, max-age=31536000 |
Share this report
<a href="https://carbonless.cc/report/arcprize.org/results/deepseek-v4-flash-0731"><img src="https://carbonless.cc/api/badge?url=https%3A%2F%2Farcprize.org%2Fresults%2Fdeepseek-v4-flash-0731" alt="Carbon rating for this page" width="150" height="30" loading="lazy" /></a>The badge is a lightweight SVG (under 1 kB) served with long-lived caching, so a new scan can take up to a day to show through.