https://treccani.it
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
59
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
FCO2 Per Page LoadAction2.47g CO2 per viewFIX
CO2 Per Page Load
Action2.47g CO2 per view
2.47g CO2 per view
Critical::
2.47g CO2 per page view
This page transfers 8.7 MB, producing an estimated 2.47g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.46g, network 0.43g, end-user device 1.58g.
Got: 2.47g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 295.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 295.8 kg of CO2 annually — equivalent to charging 36978 smartphones.
2.47g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 8.7 MB
Your site
2.47g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.46g
Network
0.43g
End-user device
1.58g
At 10,000 monthly views: Monthly: 24.7 kg · Annual: 295.8 kg · ≈ 36978 smartphone charges
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Amazon Web Services✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.47g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
2.47g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 311% more
vs Target 393% more
BTransfer Efficiency85% efficientREVIEW
Transfer Efficiency
85% efficient
85% efficient
Info::
Transfer efficiency: 85%
An estimated 1299 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1299 KB of unused JavaScript. This wasted data produces 0.36g of unnecessary CO2 per page view.
Total waste: 1299 KB (15% of page weight)
Unused JS 1299 KB
0.36g unnecessary CO2 per visit
Actual transfer 8913 KB
Theoretical minimum 7614 KB
Potential savings 1299 KB (0.36g 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
A+Repeat Visit Weight93% cachedPASS
Repeat Visit Weight
93% cached
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 606 KB (vs 8913 KB first visit). 197 of 199 resources are served from browser cache, saving 2.30g CO2 per repeat visit.
Info::
Repeat visit: 0.17g CO2 (first visit: 2.47g)
First visit
8913 KB
Repeat visit
606 KB
93% reduction on repeat visits
Saving 2.30g CO2 per returning visitor
197 resources served from cache · 2 resources re-downloaded
Image Optimization66 images, 10 KB total, 0 KB wastedINFO
Image Optimization
66 images, 10 KB total, 0 KB wasted
Image Optimization Audit
Total Images
66
Total Size
10 KB
Oversized
2
1 missing alt text 65 missing dimensions 63 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.