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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
83
GRADE
B
FIX
1
REVIEW
1
PASS
5
INFO
0
Checks
75 PASS 1 REVIEW 1 FIX
DTransfer EfficiencyAction56% efficientFIX
Transfer Efficiency
Action56% efficient
56% efficient
Warning::
Transfer efficiency: 56%
An estimated 739 KB (44%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 739 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
Total waste: 739 KB (44% of page weight)
Unused JS 739 KB
0.17g unnecessary CO2 per visit
Actual transfer 1686 KB
Theoretical minimum 947 KB
Potential savings 739 KB (0.17g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
ACO2 Per Page Load0.39g CO2 per viewPASS
CO2 Per Page Load
0.39g CO2 per view
0.39g CO2 per view
Info::
0.39g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.39g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.30g.
Got: 0.39g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 46.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 46.8 kg of CO2 annually — equivalent to charging 5848 smartphones.
Info::
Green hosting reduces data center emissions
0.39g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 72% of websites
Sustainable Web Design model v4 · Page size: 1.6 MB
Your site
0.39g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.08g
End-user device
0.30g
At 10,000 monthly views: Monthly: 3.9 kg · Annual: 46.8 kg · ≈ 5848 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 35 KB (vs 1686 KB first visit). 79 of 80 resources are served from browser cache, saving 0.38g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.39g)
First visit
1686 KB
Repeat visit
35 KB
98% reduction on repeat visits
Saving 0.38g CO2 per returning visitor
79 resources served from cache · 1 resources re-downloaded
ACarbon Budget28th percentilePASS
Carbon Budget
28th percentile
28th percentile
Info::
0.39g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 72% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 28th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.39g
28th percentile
Cleaner than 72% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 35% cleaner ✓
vs Target 22% cleaner ✓
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
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.