https://dnsdumpster.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
89
GRADE
B
FIX
0
REVIEW
3
PASS
4
INFO
1
Checks
84 PASS 3 REVIEW
CTransfer EfficiencyAction75% efficientREVIEW
Transfer Efficiency
Action75% efficient
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 203 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 203 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
Total waste: 203 KB (25% of page weight)
Unused JS 203 KB
0.05g unnecessary CO2 per visit
Actual transfer 807 KB
Theoretical minimum 604 KB
Potential savings 203 KB (0.05g 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.
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
A+CO2 Per Page Load0.19g CO2 per viewPASS
CO2 Per Page Load
0.19g CO2 per view
0.19g CO2 per view
Info::
0.19g CO2 per page view
This page transfers 0.8 MB, producing an estimated 0.19g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.04g, end-user device 0.14g.
Got: 0.19g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 22.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 22.4 kg of CO2 annually — equivalent to charging 2801 smartphones.
Info::
Green hosting reduces data center emissions
0.19g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.8 MB
Your site
0.19g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.04g
End-user device
0.14g
At 10,000 monthly views: Monthly: 1.9 kg · Annual: 22.4 kg · ≈ 2801 smartphone charges
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Not identified✗CDN Cloudflare✓
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 22 KB (vs 807 KB first visit). 42 of 43 resources are served from browser cache, saving 0.18g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.19g)
First visit
807 KB
Repeat visit
22 KB
97% reduction on repeat visits
Saving 0.18g CO2 per returning visitor
42 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.19g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.19g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 69% cleaner ✓
vs Target 63% cleaner ✓
Image Optimization1 images, 3 KB total, 0 KB wastedINFO
Image Optimization
1 images, 3 KB total, 0 KB wasted
Image Optimization Audit
Total Images
1
Total Size
3 KB
1 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.