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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
1
REVIEW
2
PASS
4
INFO
1
Device:
Mobile Desktop
Checks
8
4 PASS 2 REVIEW 1 FIX
D
Transfer Efficiency
Action
50% efficient
FIX
50% efficient
Critical::
Transfer efficiency: 50%
An estimated 561 KB (50%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 561 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
50% efficient

Total waste: 561 KB (50% of page weight)

Unused JS 561 KB

0.13g unnecessary CO2 per visit

Actual transfer 1117 KB
Theoretical minimum 556 KB
Potential savings 561 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: Verified by the Green Web Foundation
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 Hosting✓ Green Hosted
Hosting Apache HTTP Server✓CDN Not identified✗

Apache HTTP Server: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Web Font Weight Variants
Action
23 font weights loaded across 1 famil(y/ies)
REVIEW
23 font weights loaded across 1 famil(y/ies)
Warning::
23 font weights loaded -- likely 100+ KB of unused payload
Loading 23 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: Archivo.
A
CO2 Per Page Load
0.26g CO2 per view
PASS
0.26g CO2 per view
Info::
0.26g CO2 per page view
This page transfers 1.1 MB, producing an estimated 0.26g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.20g.
Got: 0.26g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 31.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 31.0 kg of CO2 annually — equivalent to charging 3875 smartphones.
Info::
Green hosting reduces data center emissions

0.26g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 85% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site
0.26g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.05g
End-user device
0.20g
At 10,000 monthly views: Monthly: 2.6 kg · Annual: 31.0 kg · ≈ 3875 smartphone charges
A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 60 KB (vs 1117 KB first visit). 31 of 32 resources are served from browser cache, saving 0.24g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.26g)
First visit
1117 KB
Repeat visit
60 KB

95% reduction on repeat visits

Saving 0.24g CO2 per returning visitor

31 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
15th percentile
PASS
15th percentile
Info::
0.26g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 85% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 15th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.26g

15th percentile

Cleaner than 85% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 57% cleaner ✓
vs Target 48% cleaner ✓
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: OVHcloud

Image Optimization
4 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

4

Total Size

0 KB

4 missing dimensions 4 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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