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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
90
GRADE
A
FIX
0
REVIEW
1
PASS
5
INFO
0
Device:
Mobile Desktop
Checks
6
5 PASS 1 REVIEW
B
Transfer Efficiency
76% efficient
REVIEW
76% efficient
Info::
Transfer efficiency: 76%
An estimated 356 KB (24%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 356 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
76% efficient

Total waste: 356 KB (24% of page weight)

Unused JS 356 KB

0.08g unnecessary CO2 per visit

Actual transfer 1504 KB
Theoretical minimum 1147 KB
Potential savings 356 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.35g CO2 per view
PASS
0.35g CO2 per view
Info::
0.35g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.35g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.27g.
Got: 0.35g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 41.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 41.7 kg of CO2 annually — equivalent to charging 5216 smartphones.
Info::
Green hosting reduces data center emissions

0.35g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 76% of websites

Sustainable Web Design model v4 · Page size: 1.5 MB

Your site
0.35g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.07g
End-user device
0.27g
At 10,000 monthly views: Monthly: 3.5 kg · Annual: 41.7 kg · ≈ 5216 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 29 KB (vs 1504 KB first visit). 106 of 108 resources are served from browser cache, saving 0.34g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.35g)
First visit
1504 KB
Repeat visit
29 KB

98% reduction on repeat visits

Saving 0.34g CO2 per returning visitor

106 resources served from cache · 2 resources re-downloaded

A
Carbon Budget
24th percentile
PASS
24th percentile
Info::
0.35g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 76% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 24th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.35g

24th percentile

Cleaner than 76% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 42% cleaner ✓
vs Target 30% 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: Cloudflare

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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