https://Yellowizard.gr
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
76
GRADE
C
FIX
1
REVIEW
5
PASS
1
INFO
1
Checks
81 PASS 5 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
BCO2 Per Page Load0.56g CO2 per viewREVIEW
CO2 Per Page Load
0.56g CO2 per view
0.56g CO2 per view
Info::
0.56g CO2 per page view
This page transfers 2.0 MB, producing an estimated 0.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.10g, end-user device 0.36g.
Got: 0.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 67.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 67.3 kg of CO2 annually — equivalent to charging 8418 smartphones.
0.56g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 54% of websites
Sustainable Web Design model v4 · Page size: 2.0 MB
Your site
0.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.10g
Network
0.10g
End-user device
0.36g
At 10,000 monthly views: Monthly: 5.6 kg · Annual: 67.3 kg · ≈ 8418 smartphone charges
BCarbon Budget46th percentileREVIEW
Carbon Budget
46th percentile
46th percentile
Info::
0.56g 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
0.56g
46th percentile
Cleaner than 54% of websites
✗ Above the median website
vs Median 6% cleaner ✓
vs Target 12% more
BTransfer Efficiency86% efficientREVIEW
Transfer Efficiency
86% efficient
86% efficient
Info::
Transfer efficiency: 86%
An estimated 281 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 281 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
Total waste: 281 KB (14% of page weight)
Unused JS 281 KB
0.08g unnecessary CO2 per visit
Actual transfer 2029 KB
Theoretical minimum 1748 KB
Potential savings 281 KB (0.08g 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 117 KB (vs 2029 KB first visit). 147 of 149 resources are served from browser cache, saving 0.53g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.56g)
First visit
2029 KB
Repeat visit
117 KB
94% reduction on repeat visits
Saving 0.53g CO2 per returning visitor
147 resources served from cache · 2 resources re-downloaded
Image Optimization117 images, 4 KB total, 0 KB wastedINFO
Image Optimization
117 images, 4 KB total, 0 KB wasted
Image Optimization Audit
Total Images
117
Total Size
4 KB
Oversized
9
5 missing alt text 3 missing dimensions 5 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.