https://www.deventer.nl
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
90
GRADE
A
FIX
0
REVIEW
4
PASS
3
INFO
1
Checks
83 PASS 4 REVIEW
BCO2 Per Page Load0.51g CO2 per viewREVIEW
CO2 Per Page Load
0.51g CO2 per view
0.51g CO2 per view
Info::
0.51g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.39g.
Got: 0.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 61.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 61.3 kg of CO2 annually — equivalent to charging 7656 smartphones.
Info::
Green hosting reduces data center emissions
0.51g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 59% of websites
Sustainable Web Design model v4 · Page size: 2.2 MB
Your site
0.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.11g
End-user device
0.39g
At 10,000 monthly views: Monthly: 5.1 kg · Annual: 61.3 kg · ≈ 7656 smartphone charges
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Leaseweb Global BV uses renewable energy
Info::
Leaseweb Global BV: 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 Leaseweb Global BV✓CDN Not identified✗
Leaseweb Global BV: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCarbon Budget41th percentileREVIEW
Carbon Budget
41th percentile
41th percentile
Info::
0.51g CO2 — below the median website (0.60g)
Better than an estimated 59% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 41th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.51g
41st percentile
Cleaner than 59% of websites
✗ Above the median website
vs Median 15% cleaner ✓
vs Target 2% more
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+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 17 KB (vs 2208 KB first visit). 91 of 93 resources are served from browser cache, saving 0.51g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.51g)
First visit
2208 KB
Repeat visit
17 KB
99% reduction on repeat visits
Saving 0.51g CO2 per returning visitor
91 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 20 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 20 KB (1% of page weight)
Unused JS 20 KB
0.00g unnecessary CO2 per visit
Actual transfer 2208 KB
Theoretical minimum 2187 KB
Potential savings 20 KB (0.00g CO2)
See Deep Analysis sections above for specific optimizations.
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: Leaseweb Global BV
Image Optimization13 images, 779 KB total, 0 KB wastedINFO
Image Optimization
13 images, 779 KB total, 0 KB wasted
Image Optimization Audit
Total Images
13
Total Size
779 KB
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.