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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
89
GRADE
B
FIX
1
REVIEW
2
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
7
4 PASS 2 REVIEW 1 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

B
Web Font Weight Variants
7 font weights loaded across 3 famil(y/ies)
REVIEW
7 font weights loaded across 3 famil(y/ies)
Info::
7 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Barlow Condensed, Lora, Playfair Display.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
CO2 Per Page Load
0.06g CO2 per view
PASS
0.06g CO2 per view
Info::
0.06g CO2 per page view
This page transfers 0.2 MB, producing an estimated 0.06g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.01g, end-user device 0.04g.
Got: 0.06g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 7.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 7.4 kg of CO2 annually — equivalent to charging 928 smartphones.

0.06g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.2 MB

Your site
0.06g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.01g
End-user device
0.04g
At 10,000 monthly views: Monthly: 0.6 kg · Annual: 7.4 kg · ≈ 928 smartphone charges
A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 11 KB (vs 223 KB first visit). 14 of 15 resources are served from browser cache, saving 0.06g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.06g)
First visit
223 KB
Repeat visit
11 KB

95% reduction on repeat visits

Saving 0.06g CO2 per returning visitor

14 resources served from cache · 1 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.06g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.06g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 90% cleaner ✓
vs Target 88% cleaner ✓
A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 223 KB
Theoretical minimum 223 KB

See Deep Analysis sections above for specific optimizations.

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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