http://www.lindaschlapfer.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
77
GRADE
C
FIX
1
REVIEW
5
PASS
1
INFO
1
Checks
81 PASS 5 REVIEW 1 FIX
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::
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 Not identified✗CDN Squarespace✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCO2 Per Page Load0.57g CO2 per viewREVIEW
CO2 Per Page Load
0.57g CO2 per view
0.57g CO2 per view
Info::
0.57g CO2 per page view
This page transfers 2.0 MB, producing an estimated 0.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.36g.
Got: 0.57g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 68.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 68.1 kg of CO2 annually — equivalent to charging 8510 smartphones.
0.57g
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
0.57g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.11g
Network
0.10g
End-user device
0.36g
At 10,000 monthly views: Monthly: 5.7 kg · Annual: 68.1 kg · ≈ 8510 smartphone charges
BCarbon Budget46th percentileREVIEW
Carbon Budget
46th percentile
46th percentile
Info::
0.57g 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
0.57g
46th percentile
Cleaner than 54% of websites
✗ Above the median website
vs Median 5% cleaner ✓
vs Target 13% more
BTransfer Efficiency86% efficientREVIEW
Transfer Efficiency
86% efficient
86% efficient
Info::
Transfer efficiency: 86%
An estimated 284 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 284 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
Total waste: 284 KB (14% of page weight)
Unused JS 284 KB
0.08g unnecessary CO2 per visit
Actual transfer 2051 KB
Theoretical minimum 1767 KB
Potential savings 284 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 36 KB (vs 2051 KB first visit). 73 of 74 resources are served from browser cache, saving 0.56g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.57g)
First visit
2051 KB
Repeat visit
36 KB
98% reduction on repeat visits
Saving 0.56g CO2 per returning visitor
73 resources served from cache · 1 resources re-downloaded
Image Optimization11 images, 860 KB total, 325 KB wastedINFO
Image Optimization
11 images, 860 KB total, 325 KB wasted
Image Optimization Audit
Total Images
11
Total Size
860 KB
Oversized
3
Wasted
325 KB
2 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.