https://roccosiffredi.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
86
GRADE
B
FIX
0
REVIEW
4
PASS
3
INFO
1
Checks
83 PASS 4 REVIEW
BCO2 Per Page Load0.57g CO2 per viewREVIEW
CO2 Per Page Load
0.57g CO2 per view
0.57g CO2 per view
Info::
0.57g CO2 per page view
This page transfers 2.4 MB, producing an estimated 0.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.43g.
Got: 0.57g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 67.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 67.8 kg of CO2 annually — equivalent to charging 8477 smartphones.
Info::
Green hosting reduces data center emissions
0.57g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 54% of websites
Sustainable Web Design model v4 · Page size: 2.4 MB
Your site
0.57g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.12g
End-user device
0.43g
At 10,000 monthly views: Monthly: 5.7 kg · Annual: 67.8 kg · ≈ 8477 smartphone charges
BCarbon Budget46th percentileREVIEW
Carbon Budget
46th percentile
46th percentile
Info::
0.57g CO2 — below the median website (0.60g)
Better than an estimated 54% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 46th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.57g
46th percentile
Cleaner than 54% of websites
✗ Above the median website
vs Median 6% cleaner ✓
vs Target 13% more
BTransfer Efficiency82% efficientREVIEW
Transfer Efficiency
82% efficient
82% efficient
Info::
Transfer efficiency: 82%
An estimated 450 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 450 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
Total waste: 450 KB (18% of page weight)
Unused JS 450 KB
0.10g unnecessary CO2 per visit
Actual transfer 2445 KB
Theoretical minimum 1994 KB
Potential savings 450 KB (0.10g 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.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Hosting✓ Green Hosted
Hosting Cloudflare✓CDN Cloudflare✓
Cloudflare: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 19 KB (vs 2445 KB first visit). 100 of 102 resources are served from browser cache, saving 0.56g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.57g)
First visit
2445 KB
Repeat visit
19 KB
99% reduction on repeat visits
Saving 0.56g CO2 per returning visitor
100 resources served from cache · 2 resources re-downloaded
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Image Optimization24 images, 0 KB total, 0 KB wastedINFO
Image Optimization
24 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
24
Total Size
0 KB
Oversized
4
13 missing dimensions 8 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.