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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
73
GRADE
C
FIX
2
REVIEW
3
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 3 REVIEW 2 FIX
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 identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
54th percentile
FIX
54th percentile
Warning::
0.75g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.75g

54th percentile

Cleaner than 46% of websites

✗ Above the median website

vs Median 24% more
vs Target 49% more
B
CO2 Per Page Load
0.75g CO2 per view
REVIEW
0.75g CO2 per view
Info::
0.75g CO2 per page view
This page transfers 2.6 MB, producing an estimated 0.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.48g.
Got: 0.75g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 89.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 89.4 kg of CO2 annually — equivalent to charging 11175 smartphones.

0.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 46% of websites

Sustainable Web Design model v4 · Page size: 2.6 MB

Your site
0.75g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.14g
Network
0.13g
End-user device
0.48g
At 10,000 monthly views: Monthly: 7.5 kg · Annual: 89.4 kg · ≈ 11175 smartphone charges
C
Web Font Weight Variants
Action
18 font weights loaded across 4 famil(y/ies)
REVIEW
18 font weights loaded across 4 famil(y/ies)
Warning::
18 font weights loaded -- likely 100+ KB of unused payload
Loading 18 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Open Sans, Roboto, Satisfy, Source Sans Pro.
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 44 KB (vs 2693 KB first visit). 102 of 103 resources are served from browser cache, saving 0.73g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.75g)
First visit
2693 KB
Repeat visit
44 KB

98% reduction on repeat visits

Saving 0.73g CO2 per returning visitor

102 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 97 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 97 KB (4% of page weight)

Unused JS 97 KB

0.03g unnecessary CO2 per visit

Actual transfer 2693 KB
Theoretical minimum 2596 KB
Potential savings 97 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
38 images, 1881 KB total, 1019 KB wasted
INFO

Image Optimization Audit

Total Images

38

Total Size

1881 KB

Oversized

4

Wasted

1019 KB

4 missing alt text 35 missing dimensions 34 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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