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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
76
GRADE
C
FIX
2
REVIEW
4
PASS
1
INFO
1
Device:
Mobile Desktop
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::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
Info::
Azure CDN: Inherits Azure regional renewable mix
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 Azure✗CDN Azure CDN✗

Azure: Microsoft is carbon-negative; Azure renewable varies by region

Azure CDN: Inherits Azure regional renewable mix

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
51th percentile
FIX
51th percentile
Warning::
0.66g CO2 — above the median website (0.60g)
Heavier than an estimated 49% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 51th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.66g

51st percentile

Cleaner than 49% of websites

✗ Above the median website

vs Median 10% more
vs Target 32% more
B
CO2 Per Page Load
0.66g CO2 per view
REVIEW
0.66g CO2 per view
Info::
0.66g CO2 per page view
This page transfers 2.3 MB, producing an estimated 0.66g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.42g.
Got: 0.66g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 79.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 79.4 kg of CO2 annually — equivalent to charging 9921 smartphones.

0.66g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 49% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site
0.66g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
0.11g
End-user device
0.42g
At 10,000 monthly views: Monthly: 6.6 kg · Annual: 79.4 kg · ≈ 9921 smartphone charges
B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 375 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 375 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
84% efficient

Total waste: 375 KB (16% of page weight)

Unused JS 375 KB

0.10g unnecessary CO2 per visit

Actual transfer 2391 KB
Theoretical minimum 2016 KB
Potential savings 375 KB (0.10g 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 36 KB (vs 2391 KB first visit). 57 of 58 resources are served from browser cache, saving 0.65g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.66g)
First visit
2391 KB
Repeat visit
36 KB

98% reduction on repeat visits

Saving 0.65g CO2 per returning visitor

57 resources served from cache · 1 resources re-downloaded

Image Optimization
8 images, 368 KB total, 321 KB wasted
INFO

Image Optimization Audit

Total Images

8

Total Size

368 KB

Oversized

4

Wasted

321 KB

6 missing dimensions 5 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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