https://pnpm.io
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
2
PASS
4
INFO
0
Checks
64 PASS 2 REVIEW
BTransfer Efficiency89% efficientREVIEW
Transfer Efficiency
89% efficient
89% efficient
Info::
Transfer efficiency: 89%
An estimated 190 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 190 KB of unused JavaScript. This wasted data produces 0.04g of unnecessary CO2 per page view.
Total waste: 190 KB (11% of page weight)
Unused JS 190 KB
0.04g unnecessary CO2 per visit
Actual transfer 1655 KB
Theoretical minimum 1465 KB
Potential savings 190 KB (0.04g CO2)
See Deep Analysis sections above for specific optimizations.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
ACO2 Per Page Load0.38g CO2 per viewPASS
CO2 Per Page Load
0.38g CO2 per view
0.38g CO2 per view
Info::
0.38g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.38g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.29g.
Got: 0.38g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 45.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 45.9 kg of CO2 annually — equivalent to charging 5740 smartphones.
Info::
Green hosting reduces data center emissions
0.38g
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
0.38g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 3.8 kg · Annual: 45.9 kg · ≈ 5740 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Vercel, CDN: Vercel
Info::
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
Info::
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
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 Vercel✓CDN Vercel✓
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight92% cachedPASS
Repeat Visit Weight
92% cached
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 124 KB (vs 1655 KB first visit). 70 of 73 resources are served from browser cache, saving 0.35g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.38g)
First visit
1655 KB
Repeat visit
124 KB
92% reduction on repeat visits
Saving 0.35g CO2 per returning visitor
70 resources served from cache · 3 resources re-downloaded
ACarbon Budget28th percentilePASS
Carbon Budget
28th percentile
28th percentile
Info::
0.38g 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
0.38g
28th percentile
Cleaner than 72% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 36% cleaner ✓
vs Target 23% cleaner ✓
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.