https://Soullumos.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
66
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 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
DCarbon BudgetAction55th percentileFIX
Carbon Budget
Action55th percentile
55th percentile
Warning::
0.79g CO2 — above the median website (0.60g)
Heavier than an estimated 45% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 55th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.79g
55th percentile
Cleaner than 45% of websites
✗ Above the median website
vs Median 31% more
vs Target 57% more
DTransfer EfficiencyAction60% efficientFIX
Transfer Efficiency
Action60% efficient
60% efficient
Warning::
Transfer efficiency: 60%
An estimated 1141 KB (40%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1141 KB of unused JavaScript. This wasted data produces 0.32g of unnecessary CO2 per page view.
Total waste: 1141 KB (40% of page weight)
Unused JS 1141 KB
0.32g unnecessary CO2 per visit
Actual transfer 2838 KB
Theoretical minimum 1696 KB
Potential savings 1141 KB (0.32g CO2)
See Deep Analysis sections above for specific optimizations.
BCO2 Per Page Load0.79g CO2 per viewREVIEW
CO2 Per Page Load
0.79g CO2 per view
0.79g CO2 per view
Info::
0.79g CO2 per page view
This page transfers 2.8 MB, producing an estimated 0.79g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.15g, network 0.14g, end-user device 0.50g.
Got: 0.79g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 94.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 94.2 kg of CO2 annually — equivalent to charging 11776 smartphones.
0.79g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 45% of websites
Sustainable Web Design model v4 · Page size: 2.8 MB
Your site
0.79g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.15g
Network
0.14g
End-user device
0.50g
At 10,000 monthly views: Monthly: 7.9 kg · Annual: 94.2 kg · ≈ 11776 smartphone charges
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+Repeat Visit Weight92% cachedPASS
Repeat Visit Weight
92% cached
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 237 KB (vs 2838 KB first visit). 93 of 99 resources are served from browser cache, saving 0.72g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 0.79g)
First visit
2838 KB
Repeat visit
237 KB
92% reduction on repeat visits
Saving 0.72g CO2 per returning visitor
93 resources served from cache · 6 resources re-downloaded
Image Optimization20 images, 1 KB total, 0 KB wastedINFO
Image Optimization
20 images, 1 KB total, 0 KB wasted
Image Optimization Audit
Total Images
20
Total Size
1 KB
5 missing alt text 12 missing dimensions 14 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.