https://ldns.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
95
GRADE
A
FIX
0
REVIEW
2
PASS
5
INFO
1
Checks
85 PASS 2 REVIEW
BTransfer Efficiency78% efficientREVIEW
Transfer Efficiency
78% efficient
78% efficient
Info::
Transfer efficiency: 78%
An estimated 66 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 66 KB of unused JavaScript. This wasted data produces 0.02g of unnecessary CO2 per page view.
Total waste: 66 KB (22% of page weight)
Unused JS 66 KB
0.02g unnecessary CO2 per visit
Actual transfer 304 KB
Theoretical minimum 237 KB
Potential savings 66 KB (0.02g 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.
A+CO2 Per Page Load0.07g CO2 per viewPASS
CO2 Per Page Load
0.07g CO2 per view
0.07g CO2 per view
Info::
0.07g CO2 per page view
This page transfers 0.3 MB, producing an estimated 0.07g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.01g, end-user device 0.05g.
Got: 0.07g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 8.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 8.4 kg of CO2 annually — equivalent to charging 1054 smartphones.
Info::
Green hosting reduces data center emissions
0.07g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.3 MB
Your site
0.07g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.01g
End-user device
0.05g
At 10,000 monthly views: Monthly: 0.7 kg · Annual: 8.4 kg · ≈ 1054 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 Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 9 KB (vs 304 KB first visit). 39 of 40 resources are served from browser cache, saving 0.07g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.07g)
First visit
304 KB
Repeat visit
9 KB
97% reduction on repeat visits
Saving 0.07g CO2 per returning visitor
39 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.07g 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
0.07g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 88% cleaner ✓
vs Target 86% 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
Image Optimization3 images, 0 KB total, 0 KB wastedINFO
Image Optimization
3 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
3
Total Size
0 KB
3 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.