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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
75
GRADE
C
FIX
1
REVIEW
1
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 1 REVIEW 1 FIX
F
Transfer Efficiency
Action
7% efficient
FIX
7% efficient
Critical::
Transfer efficiency: 7%
An estimated 1861 KB (93%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1861 KB of unused JavaScript. This wasted data produces 0.43g of unnecessary CO2 per page view.
7% efficient

Total waste: 1861 KB (93% of page weight)

Unused JS 1861 KB

0.43g unnecessary CO2 per visit

Actual transfer 1994 KB
Theoretical minimum 133 KB
Potential savings 1861 KB (0.43g CO2)

See Deep Analysis sections above for specific optimizations.

B
Carbon Budget
36th percentile
REVIEW
36th percentile
Info::
0.46g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 64% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 36th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.46g

36th percentile

Cleaner than 64% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 23% cleaner ✓
vs Target 8% cleaner ✓
A
CO2 Per Page Load
0.46g CO2 per view
PASS
0.46g CO2 per view
Info::
0.46g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.46g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.35g.
Got: 0.46g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 55.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 55.3 kg of CO2 annually — equivalent to charging 6916 smartphones.
Info::
Green hosting reduces data center emissions

0.46g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 64% of websites

Sustainable Web Design model v4 · Page size: 1.9 MB

Your site
0.46g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.10g
End-user device
0.35g
At 10,000 monthly views: Monthly: 4.6 kg · Annual: 55.3 kg · ≈ 6916 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓

Next.js: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 6 KB (vs 1994 KB first visit). 113 of 114 resources are served from browser cache, saving 0.46g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.46g)
First visit
1994 KB
Repeat visit
6 KB

100% reduction on repeat visits

Saving 0.46g CO2 per returning visitor

113 resources served from cache · 1 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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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