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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
64
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.42g CO2 per view
FIX
2.42g CO2 per view
Critical::
2.42g CO2 per page view
This page transfers 8.6 MB, producing an estimated 2.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.45g, network 0.42g, end-user device 1.56g.
Got: 2.42g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 290.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 290.7 kg of CO2 annually — equivalent to charging 36339 smartphones.

2.42g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.6 MB

Your site
2.42g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.45g
Network
0.42g
End-user device
1.56g
At 10,000 monthly views: Monthly: 24.2 kg · Annual: 290.7 kg · ≈ 36339 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their 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 HostingUnable to Determine
Hosting Not identifiedCDN Not identified

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.42g 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

2.42g

95th percentile

Cleaner than 5% of websites

Above the median website

vs Median 304% more
vs Target 385% more
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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 59 KB (vs 8759 KB first visit). 97 of 98 resources are served from browser cache, saving 2.41g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.42g)
First visit
8759 KB
Repeat visit
59 KB

99% reduction on repeat visits

Saving 2.41g CO2 per returning visitor

97 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 403 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 403 KB (5% of page weight)

Unused JS 403 KB

0.11g unnecessary CO2 per visit

Actual transfer 8759 KB
Theoretical minimum 8356 KB
Potential savings 403 KB (0.11g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
62 images, 4805 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

62

Total Size

4805 KB

10 missing alt text 62 missing dimensions 16 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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