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
4
PASS
2
INFO
1
Checks
82 PASS 4 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
BCarbon Budget33th percentileREVIEW
Carbon Budget
33th percentile
33th percentile
Info::
0.44g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 67% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 33th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.44g
33rd percentile
Cleaner than 67% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 27% cleaner ✓
vs Target 12% cleaner ✓
CTransfer EfficiencyAction72% efficientREVIEW
Transfer Efficiency
Action72% efficient
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 441 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 441 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
Total waste: 441 KB (28% of page weight)
Unused JS 441 KB
0.12g unnecessary CO2 per visit
Actual transfer 1582 KB
Theoretical minimum 1140 KB
Potential savings 441 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 Load0.44g CO2 per viewPASS
CO2 Per Page Load
0.44g CO2 per view
0.44g CO2 per view
Info::
0.44g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.08g, end-user device 0.28g.
Got: 0.44g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 52.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 52.5 kg of CO2 annually — equivalent to charging 6563 smartphones.
0.44g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 67% of websites
Sustainable Web Design model v4 · Page size: 1.5 MB
Your site
0.44g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.08g
Network
0.08g
End-user device
0.28g
At 10,000 monthly views: Monthly: 4.4 kg · Annual: 52.5 kg · ≈ 6563 smartphone charges
A+Repeat Visit Weight94% cachedPASS
Repeat Visit Weight
94% cached
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 94 KB (vs 1582 KB first visit). 106 of 107 resources are served from browser cache, saving 0.41g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.44g)
First visit
1582 KB
Repeat visit
94 KB
94% reduction on repeat visits
Saving 0.41g CO2 per returning visitor
106 resources served from cache · 1 resources re-downloaded
Image Optimization200 images, 4 KB total, 0 KB wastedINFO
Image Optimization
200 images, 4 KB total, 0 KB wasted
Image Optimization Audit
Total Images
200
Total Size
4 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.