https://Webnetz.de
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
78
GRADE
C
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
FCO2 Per Page LoadAction1.52g CO2 per viewFIX
CO2 Per Page Load
Action1.52g CO2 per view
1.52g CO2 per view
Warning::
1.52g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.52g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.26g, end-user device 0.98g.
Got: 1.52g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 182.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 182.8 kg of CO2 annually — equivalent to charging 22848 smartphones.
1.52g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 24% of websites
Sustainable Web Design model v4 · Page size: 5.4 MB
Your site
1.52g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.28g
Network
0.26g
End-user device
0.98g
At 10,000 monthly views: Monthly: 15.2 kg · Annual: 182.8 kg · ≈ 22848 smartphone charges
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 Apache HTTP Server✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction76th percentileFIX
Carbon Budget
Action76th percentile
76th percentile
Warning::
1.52g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.52g
76th percentile
Cleaner than 24% of websites
✗ Above the median website
vs Median 154% more
vs Target 205% 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.
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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 54 KB (vs 5507 KB first visit). 112 of 114 resources are served from browser cache, saving 1.51g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.52g)
First visit
5507 KB
Repeat visit
54 KB
99% reduction on repeat visits
Saving 1.51g CO2 per returning visitor
112 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency98% efficientPASS
Transfer Efficiency
98% efficient
98% efficient
Info::
Transfer efficiency: 98%
Only 131 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 131 KB (2% of page weight)
Unused JS 131 KB
0.04g unnecessary CO2 per visit
Actual transfer 5507 KB
Theoretical minimum 5376 KB
Potential savings 131 KB (0.04g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization129 images, 249 KB total, 38 KB wastedINFO
Image Optimization
129 images, 249 KB total, 38 KB wasted
Image Optimization Audit
Total Images
129
Total Size
249 KB
Oversized
9
Wasted
38 KB
16 missing alt text 31 missing dimensions 106 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.