https://gesafe-hennel.de
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
75
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
DCO2 Per Page LoadAction0.87g CO2 per viewFIX
CO2 Per Page Load
Action0.87g CO2 per view
0.87g CO2 per view
Info::
0.87g CO2 per page view
This page transfers 3.7 MB, producing an estimated 0.87g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.18g, end-user device 0.67g.
Got: 0.87g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 104.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 104.6 kg of CO2 annually — equivalent to charging 13077 smartphones.
Info::
Green hosting reduces data center emissions
0.87g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 43% of websites
Sustainable Web Design model v4 · Page size: 3.7 MB
Your site
0.87g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.18g
End-user device
0.67g
At 10,000 monthly views: Monthly: 8.7 kg · Annual: 104.6 kg · ≈ 13077 smartphone charges
DCarbon BudgetAction57th percentileFIX
Carbon Budget
Action57th percentile
57th percentile
Warning::
0.87g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.87g
57th percentile
Cleaner than 43% of websites
✗ Above the median website
vs Median 45% more
vs Target 74% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: 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 Apache HTTP Server✓CDN Not identified✗
Apache HTTP Server: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
CWeb Font Weight VariantsAction36 font weights loaded across 2 famil(y/ies)REVIEW
Web Font Weight Variants
Action36 font weights loaded across 2 famil(y/ies)
36 font weights loaded across 2 famil(y/ies)
Warning::
36 font weights loaded -- likely 100+ KB of unused payload
Loading 36 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: Space Grotesk, Syncopate.
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 28 KB (vs 3771 KB first visit). 294 of 295 resources are served from browser cache, saving 0.87g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.87g)
First visit
3771 KB
Repeat visit
28 KB
99% reduction on repeat visits
Saving 0.87g CO2 per returning visitor
294 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency90% efficientPASS
Transfer Efficiency
90% efficient
90% efficient
Info::
Transfer efficiency: 90%
Only 366 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 366 KB (10% of page weight)
Unused JS 366 KB
0.08g unnecessary CO2 per visit
Actual transfer 3771 KB
Theoretical minimum 3405 KB
Potential savings 366 KB (0.08g 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: IONOS SE
Image Optimization7 images, 1174 KB total, 1138 KB wastedINFO
Image Optimization
7 images, 1174 KB total, 1138 KB wasted
Image Optimization Audit
Total Images
7
Total Size
1174 KB
Oversized
5
Wasted
1138 KB
2 missing dimensions 4 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.