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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
78
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
7
3 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.13g CO2 per view
FIX
1.13g CO2 per view
Warning::
1.13g CO2 per page view
This page transfers 4.8 MB, producing an estimated 1.13g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.23g, end-user device 0.87g.
Got: 1.13g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 136.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 136.0 kg of CO2 annually — equivalent to charging 16997 smartphones.
Info::
Green hosting reduces data center emissions

1.13g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 35% of websites

Sustainable Web Design model v4 · Page size: 4.8 MB

Your site
1.13g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.23g
End-user device
0.87g
At 10,000 monthly views: Monthly: 11.3 kg · Annual: 136.0 kg · ≈ 16997 smartphone charges
D
Carbon Budget
Action
65th percentile
FIX
65th percentile
Warning::
1.13g CO2 — above the median website (0.60g)
Heavier than an estimated 35% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 65th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.13g

65th percentile

Cleaner than 35% of websites

✗ Above the median website

vs Median 89% more
vs Target 127% more
B
Green Hosting
Green (hosting)
REVIEW
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

B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
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 Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 152 KB (vs 4902 KB first visit). 117 of 120 resources are served from browser cache, saving 1.10g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.13g)
First visit
4902 KB
Repeat visit
152 KB

97% reduction on repeat visits

Saving 1.10g CO2 per returning visitor

117 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 4902 KB
Theoretical minimum 4902 KB

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: IONOS SE

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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