https://www.dagster.io
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
76
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
DCO2 Per Page LoadAction1.17g CO2 per viewFIX
CO2 Per Page Load
Action1.17g CO2 per view
1.17g CO2 per view
Warning::
1.17g CO2 per page view
This page transfers 5.0 MB, producing an estimated 1.17g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.24g, end-user device 0.90g.
Got: 1.17g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 140.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 140.9 kg of CO2 annually — equivalent to charging 17614 smartphones.
Info::
Green hosting reduces data center emissions
1.17g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 34% of websites
Sustainable Web Design model v4 · Page size: 5.0 MB
Your site
1.17g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.24g
End-user device
0.90g
At 10,000 monthly views: Monthly: 11.7 kg · Annual: 140.9 kg · ≈ 17614 smartphone charges
DCarbon BudgetAction66th percentileFIX
Carbon Budget
Action66th percentile
66th percentile
Warning::
1.17g CO2 — above the median website (0.60g)
Heavier than an estimated 34% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 66th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.17g
66th percentile
Cleaner than 34% of websites
✗ Above the median website
vs Median 96% more
vs Target 135% more
BTransfer Efficiency89% efficientREVIEW
Transfer Efficiency
89% efficient
89% efficient
Info::
Transfer efficiency: 89%
An estimated 537 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 537 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
Total waste: 537 KB (11% of page weight)
Unused JS 537 KB
0.12g unnecessary CO2 per visit
Actual transfer 5080 KB
Theoretical minimum 4542 KB
Potential savings 537 KB (0.12g 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: 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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 26 KB (vs 5080 KB first visit). 140 of 142 resources are served from browser cache, saving 1.17g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.17g)
First visit
5080 KB
Repeat visit
26 KB
99% reduction on repeat visits
Saving 1.17g CO2 per returning visitor
140 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.