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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
82
GRADE
B
FIX
0
REVIEW
2
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 REVIEW
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Next.js uses renewable energy
Info::
Next.js: Verified by the Green Web Foundation
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 Not identified✗

Next.js: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Transfer Efficiency
Action
69% efficient
REVIEW
69% efficient
Warning::
Transfer efficiency: 69%
An estimated 359 KB (31%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 359 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
69% efficient

Total waste: 359 KB (31% of page weight)

Unused JS 359 KB

0.08g unnecessary CO2 per visit

Actual transfer 1160 KB
Theoretical minimum 800 KB
Potential savings 359 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.27g CO2 per view
PASS
0.27g CO2 per view
Info::
0.27g CO2 per page view
This page transfers 1.1 MB, producing an estimated 0.27g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.21g.
Got: 0.27g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 32.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 32.2 kg of CO2 annually — equivalent to charging 4022 smartphones.
Info::
Green hosting reduces data center emissions

0.27g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 84% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site
0.27g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.06g
End-user device
0.21g
At 10,000 monthly views: Monthly: 2.7 kg · Annual: 32.2 kg · ≈ 4022 smartphone charges
A+
Repeat Visit Weight
85% cached
PASS
85% cached
Info::
85% reduction on repeat visits
Returning visitors download only 177 KB (vs 1160 KB first visit). 76 of 78 resources are served from browser cache, saving 0.23g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.27g)
First visit
1160 KB
Repeat visit
177 KB

85% reduction on repeat visits

Saving 0.23g CO2 per returning visitor

76 resources served from cache · 2 resources re-downloaded

A
Carbon Budget
16th percentile
PASS
16th percentile
Info::
0.27g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 84% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 16th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.27g

16th percentile

Cleaner than 84% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 55% cleaner ✓
vs Target 46% cleaner ✓
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

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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