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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
71
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 REVIEW 1 FIX
F
Transfer Efficiency
Action
0% efficient
FIX
0% efficient
Critical::
Transfer efficiency: 0%
An estimated 2175 KB (100%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2175 KB of unused JavaScript. This wasted data produces 0.50g of unnecessary CO2 per page view.
0% efficient

Total waste: 2175 KB (100% of page weight)

Unused JS 2175 KB

0.50g unnecessary CO2 per visit

Actual transfer 1895 KB
Theoretical minimum 0 KB
Potential savings 2175 KB (0.50g CO2)

See Deep Analysis sections above for specific optimizations.

B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Hetzner Online GmbH uses renewable energy
Info::
Hetzner Online GmbH: 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 Hetzner Online GmbH✓CDN Not identified✗

Hetzner Online GmbH: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Carbon Budget
33th percentile
REVIEW
33th percentile
Info::
0.44g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 67% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 33th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.44g

33rd percentile

Cleaner than 67% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 27% cleaner ✓
vs Target 12% cleaner ✓
A
CO2 Per Page Load
0.44g CO2 per view
PASS
0.44g CO2 per view
Info::
0.44g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.34g.
Got: 0.44g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 52.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 52.6 kg of CO2 annually — equivalent to charging 6571 smartphones.
Info::
Green hosting reduces data center emissions

0.44g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 67% of websites

Sustainable Web Design model v4 · Page size: 1.9 MB

Your site
0.44g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.09g
End-user device
0.34g
At 10,000 monthly views: Monthly: 4.4 kg · Annual: 52.6 kg · ≈ 6571 smartphone charges
A+
Repeat Visit Weight
83% cached
PASS
83% cached
Info::
83% reduction on repeat visits
Returning visitors download only 322 KB (vs 1895 KB first visit). 529 of 574 resources are served from browser cache, saving 0.36g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 0.44g)
First visit
1895 KB
Repeat visit
322 KB

83% reduction on repeat visits

Saving 0.36g CO2 per returning visitor

529 resources served from cache · 45 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Hetzner Online GmbH

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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