https://lylaslegacy.org
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
81
GRADE
B
FIX
1
REVIEW
3
PASS
3
INFO
1
Checks
83 PASS 3 REVIEW 1 FIX
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their 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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
BTransfer Efficiency85% efficientREVIEW
Transfer Efficiency
85% efficient
85% efficient
Info::
Transfer efficiency: 85%
An estimated 202 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 202 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.
Total waste: 202 KB (15% of page weight)
Unused JS 202 KB
0.06g unnecessary CO2 per visit
Actual transfer 1348 KB
Theoretical minimum 1145 KB
Potential savings 202 KB (0.06g 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
ACO2 Per Page Load0.37g CO2 per viewPASS
CO2 Per Page Load
0.37g CO2 per view
0.37g CO2 per view
Info::
0.37g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.06g, end-user device 0.24g.
Got: 0.37g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 44.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 44.8 kg of CO2 annually — equivalent to charging 5596 smartphones.
0.37g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 73% of websites
Sustainable Web Design model v4 · Page size: 1.3 MB
Your site
0.37g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.07g
Network
0.06g
End-user device
0.24g
At 10,000 monthly views: Monthly: 3.7 kg · Annual: 44.8 kg · ≈ 5596 smartphone charges
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 21 KB (vs 1348 KB first visit). 23 of 24 resources are served from browser cache, saving 0.37g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.37g)
First visit
1348 KB
Repeat visit
21 KB
98% reduction on repeat visits
Saving 0.37g CO2 per returning visitor
23 resources served from cache · 1 resources re-downloaded
ACarbon Budget27th percentilePASS
Carbon Budget
27th percentile
27th percentile
Info::
0.37g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 73% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 27th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.37g
27th percentile
Cleaner than 73% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 38% cleaner ✓
vs Target 25% cleaner ✓
Image Optimization3 images, 109 KB total, 95 KB wastedINFO
Image Optimization
3 images, 109 KB total, 95 KB wasted
Image Optimization Audit
Total Images
3
Total Size
109 KB
Oversized
2
Wasted
95 KB
1 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.