https://conad.it
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
72
GRADE
C
FIX
2
REVIEW
3
PASS
2
INFO
1
Checks
82 PASS 3 REVIEW 2 FIX
DCO2 Per Page LoadAction0.82g CO2 per viewFIX
CO2 Per Page Load
Action0.82g CO2 per view
0.82g CO2 per view
Info::
0.82g CO2 per page view
This page transfers 3.5 MB, producing an estimated 0.82g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.63g.
Got: 0.82g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 98.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 98.7 kg of CO2 annually — equivalent to charging 12332 smartphones.
Info::
Green hosting reduces data center emissions
0.82g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 44% of websites
Sustainable Web Design model v4 · Page size: 3.5 MB
Your site
0.82g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.17g
End-user device
0.63g
At 10,000 monthly views: Monthly: 8.2 kg · Annual: 98.7 kg · ≈ 12332 smartphone charges
DCarbon BudgetAction56th percentileFIX
Carbon Budget
Action56th percentile
56th percentile
Warning::
0.82g CO2 — above the median website (0.60g)
Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 56th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.82g
56th percentile
Cleaner than 44% of websites
✗ Above the median website
vs Median 37% more
vs Target 64% more
CTransfer EfficiencyAction63% efficientREVIEW
Transfer Efficiency
Action63% efficient
63% efficient
Warning::
Transfer efficiency: 63%
An estimated 1301 KB (37%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1301 KB of unused JavaScript. This wasted data produces 0.30g of unnecessary CO2 per page view.
Total waste: 1301 KB (37% of page weight)
Unused JS 1301 KB
0.30g unnecessary CO2 per visit
Actual transfer 3556 KB
Theoretical minimum 2255 KB
Potential savings 1301 KB (0.30g 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
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
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 Not identified✗CDN Fastly✓
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 70 KB (vs 3556 KB first visit). 85 of 87 resources are served from browser cache, saving 0.81g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.82g)
First visit
3556 KB
Repeat visit
70 KB
98% reduction on repeat visits
Saving 0.81g CO2 per returning visitor
85 resources served from cache · 2 resources re-downloaded
Image Optimization123 images, 2196 KB total, 0 KB wastedINFO
Image Optimization
123 images, 2196 KB total, 0 KB wasted
Image Optimization Audit
Total Images
123
Total Size
2196 KB
123 missing dimensions 109 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.