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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
62
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.92g CO2 per view
FIX
2.92g CO2 per view
Critical::
2.92g CO2 per page view
This page transfers 12.3 MB, producing an estimated 2.92g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.60g, end-user device 2.24g.
Got: 2.92g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 350.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 350.7 kg of CO2 annually — equivalent to charging 43838 smartphones.
Info::
Green hosting reduces data center emissions

2.92g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 12.3 MB

Your site
2.92g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.60g
End-user device
2.24g
At 10,000 monthly views: Monthly: 29.2 kg · Annual: 350.7 kg · ≈ 43838 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.92g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.92g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 387% more
vs Target 485% more
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 1795 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1795 KB of unused JavaScript. This wasted data produces 0.41g of unnecessary CO2 per page view.
86% efficient

Total waste: 1795 KB (14% of page weight)

Unused JS 1795 KB

0.41g unnecessary CO2 per visit

Actual transfer 12644 KB
Theoretical minimum 10848 KB
Potential savings 1795 KB (0.41g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Vercel CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green Hosting✓ Green Hosted
Hosting Next.js✗CDN Vercel✓

Vercel: Hosted on AWS/Google Cloud with renewable energy commitments

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 40 KB (vs 12644 KB first visit). 136 of 141 resources are served from browser cache, saving 2.91g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.92g)
First visit
12644 KB
Repeat visit
40 KB

100% reduction on repeat visits

Saving 2.91g CO2 per returning visitor

136 resources served from cache · 5 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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