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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
71
GRADE
C
FIX
2
REVIEW
4
PASS
1
INFO
1
Checks
8
1 PASS 4 REVIEW 2 FIX
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Next.jsCDN Not identified

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
53th percentile
FIX
53th percentile
Warning::
0.73g CO2 — above the median website (0.60g)
Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 53th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.73g

53rd percentile

Cleaner than 47% of websites

Above the median website

vs Median 22% more
vs Target 47% more
B
CO2 Per Page Load
0.73g CO2 per view
REVIEW
0.73g CO2 per view
Info::
0.73g CO2 per page view
This page transfers 2.6 MB, producing an estimated 0.73g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.47g.
Got: 0.73g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 88.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 88.0 kg of CO2 annually — equivalent to charging 10997 smartphones.

0.73g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 47% of websites

Sustainable Web Design model v4 · Page size: 2.6 MB

Your site
0.73g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.14g
Network
0.13g
End-user device
0.47g
At 10,000 monthly views: Monthly: 7.3 kg · Annual: 88.0 kg · ≈ 10997 smartphone charges
C
Transfer Efficiency
Action
75% efficient
REVIEW
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 674 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 674 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
75% efficient

Total waste: 674 KB (25% of page weight)

Unused JS 674 KB

0.19g unnecessary CO2 per visit

Actual transfer 2651 KB
Theoretical minimum 1976 KB
Potential savings 674 KB (0.19g CO2)

See Deep Analysis sections above for specific optimizations.

B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 59 KB (vs 2651 KB first visit). 139 of 140 resources are served from browser cache, saving 0.72g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.73g)
First visit
2651 KB
Repeat visit
59 KB

98% reduction on repeat visits

Saving 0.72g CO2 per returning visitor

139 resources served from cache · 1 resources re-downloaded

Image Optimization
67 images, 368 KB total, 32 KB wasted
INFO

Image Optimization Audit

Total Images

67

Total Size

368 KB

Oversized

9

Wasted

32 KB

51 missing dimensions 66 missing lazy loading
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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