https://virgilio.it
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
78
GRADE
C
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
CTransfer EfficiencyAction66% efficientREVIEW
Transfer Efficiency
Action66% efficient
66% efficient
Warning::
Transfer efficiency: 66%
An estimated 425 KB (34%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 425 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
Total waste: 425 KB (34% of page weight)
Unused JS 425 KB
0.12g unnecessary CO2 per visit
Actual transfer 1247 KB
Theoretical minimum 821 KB
Potential savings 425 KB (0.12g 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 Load0.34g CO2 per viewPASS
CO2 Per Page Load
0.34g CO2 per view
0.34g CO2 per view
Info::
0.34g CO2 per page view
This page transfers 1.2 MB, producing an estimated 0.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.06g, end-user device 0.22g.
Got: 0.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 41.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 41.4 kg of CO2 annually — equivalent to charging 5173 smartphones.
0.34g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 76% of websites
Sustainable Web Design model v4 · Page size: 1.2 MB
Your site
0.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.06g
Network
0.06g
End-user device
0.22g
At 10,000 monthly views: Monthly: 3.4 kg · Annual: 41.4 kg · ≈ 5173 smartphone charges
A+Repeat Visit Weight94% cachedPASS
Repeat Visit Weight
94% cached
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 72 KB (vs 1247 KB first visit). 64 of 65 resources are served from browser cache, saving 0.32g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.34g)
First visit
1247 KB
Repeat visit
72 KB
94% reduction on repeat visits
Saving 0.32g CO2 per returning visitor
64 resources served from cache · 1 resources re-downloaded
ACarbon Budget24th percentilePASS
Carbon Budget
24th percentile
24th percentile
Info::
0.34g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 76% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 24th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.34g
24th percentile
Cleaner than 76% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 43% cleaner ✓
vs Target 31% cleaner ✓
Image Optimization200 images, 0 KB total, 0 KB wastedINFO
Image Optimization
200 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
200
Total Size
0 KB
Oversized
7
1 missing dimensions 35 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.