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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
79
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 REVIEW 1 FIX
D
Transfer Efficiency
Action
49% efficient
FIX
49% efficient
Critical::
Transfer efficiency: 49%
An estimated 909 KB (51%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 909 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
49% efficient

Total waste: 909 KB (51% of page weight)

Unused JS 909 KB

0.21g unnecessary CO2 per visit

Actual transfer 1792 KB
Theoretical minimum 883 KB
Potential savings 909 KB (0.21g CO2)

See Deep Analysis sections above for specific optimizations.

B
Carbon Budget
31th percentile
REVIEW
31th percentile
Info::
0.41g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 69% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 31th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.41g

31st percentile

Cleaner than 69% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 31% cleaner ✓
vs Target 17% cleaner ✓
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
0.41g CO2 per view
PASS
0.41g CO2 per view
Info::
0.41g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.41g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.32g.
Got: 0.41g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 49.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 49.7 kg of CO2 annually — equivalent to charging 6214 smartphones.
Info::
Green hosting reduces data center emissions

0.41g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 69% of websites

Sustainable Web Design model v4 · Page size: 1.8 MB

Your site
0.41g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.09g
End-user device
0.32g
At 10,000 monthly views: Monthly: 4.1 kg · Annual: 49.7 kg · ≈ 6214 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Google Cloud, CDN: Fastly
Info::
Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017
Info::
Fastly: 100% renewable energy for edge network
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 Google Cloud✓CDN Fastly✓

Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 70 KB (vs 1792 KB first visit). 33 of 36 resources are served from browser cache, saving 0.40g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.41g)
First visit
1792 KB
Repeat visit
70 KB

96% reduction on repeat visits

Saving 0.40g CO2 per returning visitor

33 resources served from cache · 3 resources re-downloaded

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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