https://Svennouwen.nl
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
85
GRADE
B
FIX
0
REVIEW
3
PASS
4
INFO
1
Checks
84 PASS 3 REVIEW
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Combell uses renewable energy
Info::
Combell: Verified by the Green Web Foundation
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 Combell✓CDN Not identified✗
Combell: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
CTransfer EfficiencyAction72% efficientREVIEW
Transfer Efficiency
Action72% efficient
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 195 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 195 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
Total waste: 195 KB (28% of page weight)
Unused JS 195 KB
0.05g unnecessary CO2 per visit
Actual transfer 704 KB
Theoretical minimum 509 KB
Potential savings 195 KB (0.05g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction18 font weights loaded across 1 famil(y/ies)REVIEW
Web Font Weight Variants
Action18 font weights loaded across 1 famil(y/ies)
18 font weights loaded across 1 famil(y/ies)
Warning::
18 font weights loaded -- likely 100+ KB of unused payload
Loading 18 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Plus Jakarta Sans.
A+CO2 Per Page Load0.16g CO2 per viewPASS
CO2 Per Page Load
0.16g CO2 per view
0.16g CO2 per view
Info::
0.16g CO2 per page view
This page transfers 0.7 MB, producing an estimated 0.16g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.03g, end-user device 0.13g.
Got: 0.16g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 19.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 19.5 kg of CO2 annually — equivalent to charging 2443 smartphones.
Info::
Green hosting reduces data center emissions
0.16g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.7 MB
Your site
0.16g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.03g
End-user device
0.13g
At 10,000 monthly views: Monthly: 1.6 kg · Annual: 19.5 kg · ≈ 2443 smartphone charges
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 16 KB (vs 704 KB first visit). 53 of 54 resources are served from browser cache, saving 0.16g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.16g)
First visit
704 KB
Repeat visit
16 KB
98% reduction on repeat visits
Saving 0.16g CO2 per returning visitor
53 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.16g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.16g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 73% cleaner ✓
vs Target 67% cleaner ✓
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: Combell
Image Optimization5 images, 54 KB total, 36 KB wastedINFO
Image Optimization
5 images, 54 KB total, 36 KB wasted
Image Optimization Audit
Total Images
5
Total Size
54 KB
Oversized
2
Wasted
36 KB
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.