https://player.vimeo.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
62
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction4.20g CO2 per viewFIX
CO2 Per Page Load
Action4.20g CO2 per view
4.20g CO2 per view
Critical::
4.20g CO2 per page view
This page transfers 17.8 MB, producing an estimated 4.20g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.87g, end-user device 3.23g.
Got: 4.20g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 504.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 504.4 kg of CO2 annually — equivalent to charging 63045 smartphones.
Info::
Green hosting reduces data center emissions
4.20g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 17.8 MB
Your site
4.20g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.11g
Network
0.87g
End-user device
3.23g
At 10,000 monthly views: Monthly: 42.0 kg · Annual: 504.4 kg · ≈ 63045 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
4.20g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
4.20g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 601% more
vs Target 741% more
BTransfer Efficiency88% efficientREVIEW
Transfer Efficiency
88% efficient
88% efficient
Info::
Transfer efficiency: 88%
An estimated 2164 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2164 KB of unused JavaScript. This wasted data produces 0.50g of unnecessary CO2 per page view.
Total waste: 2164 KB (12% of page weight)
Unused JS 2164 KB
0.50g unnecessary CO2 per visit
Actual transfer 18183 KB
Theoretical minimum 16019 KB
Potential savings 2164 KB (0.50g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: 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 Next.js✓CDN Cloudflare✓
Next.js: 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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 268 KB (vs 18183 KB first visit). 177 of 179 resources are served from browser cache, saving 4.14g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 4.20g)
First visit
18183 KB
Repeat visit
268 KB
99% reduction on repeat visits
Saving 4.14g CO2 per returning visitor
177 resources served from cache · 2 resources re-downloaded
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.