https://fanbyte.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
58
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
FCO2 Per Page LoadAction1.96g CO2 per viewFIX
CO2 Per Page Load
Action1.96g CO2 per view
1.96g CO2 per view
Warning::
1.96g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.96g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.36g, network 0.34g, end-user device 1.26g.
Got: 1.96g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 235.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 235.4 kg of CO2 annually — equivalent to charging 29426 smartphones.
1.96g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 12% of websites
Sustainable Web Design model v4 · Page size: 6.9 MB
Your site
1.96g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.36g
Network
0.34g
End-user device
1.26g
At 10,000 monthly views: Monthly: 19.6 kg · Annual: 235.4 kg · ≈ 29426 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗
AWS: Renewable energy varies by region; committed to 100% by 2025
AWS CloudFront: Renewable varies by edge location
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction88th percentileFIX
Carbon Budget
Action88th percentile
88th percentile
Warning::
1.96g CO2 — above the median website (0.60g)
Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 88th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.96g
88th percentile
Cleaner than 12% of websites
✗ Above the median website
vs Median 227% more
vs Target 292% more
CTransfer EfficiencyAction74% efficientREVIEW
Transfer Efficiency
Action74% efficient
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 1823 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1823 KB of unused JavaScript. This wasted data produces 0.50g of unnecessary CO2 per page view.
Total waste: 1823 KB (26% of page weight)
Unused JS 1823 KB
0.50g unnecessary CO2 per visit
Actual transfer 7093 KB
Theoretical minimum 5270 KB
Potential savings 1823 KB (0.50g 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 Weight94% cachedPASS
Repeat Visit Weight
94% cached
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 394 KB (vs 7093 KB first visit). 471 of 480 resources are served from browser cache, saving 1.85g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 1.96g)
First visit
7093 KB
Repeat visit
394 KB
94% reduction on repeat visits
Saving 1.85g CO2 per returning visitor
471 resources served from cache · 9 resources re-downloaded
Image Optimization109 images, 252 KB total, 97 KB wastedINFO
Image Optimization
109 images, 252 KB total, 97 KB wasted
Image Optimization Audit
Total Images
109
Total Size
252 KB
Oversized
22
Wasted
97 KB
64 missing alt text 4 missing dimensions 3 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.