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https://goldenwaytaxi.com

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
3
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 3 REVIEW 1 FIX
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 67 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 67 KB of unused JavaScript. This wasted data produces 0.02g of unnecessary CO2 per page view.
85% efficient

Total waste: 67 KB (15% of page weight)

Unused JS 67 KB

0.02g unnecessary CO2 per visit

Actual transfer 435 KB
Theoretical minimum 367 KB
Potential savings 67 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
CO2 Per Page Load
0.12g CO2 per view
PASS
0.12g CO2 per view
Info::
0.12g CO2 per page view
This page transfers 0.4 MB, producing an estimated 0.12g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.02g, end-user device 0.08g.
Got: 0.12g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 14.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 14.4 kg of CO2 annually — equivalent to charging 1806 smartphones.

0.12g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.4 MB

Your site
0.12g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.02g
End-user device
0.08g
At 10,000 monthly views: Monthly: 1.2 kg · Annual: 14.4 kg · ≈ 1806 smartphone charges
A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 22 KB (vs 435 KB first visit). 11 of 12 resources are served from browser cache, saving 0.11g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.12g)
First visit
435 KB
Repeat visit
22 KB

95% reduction on repeat visits

Saving 0.11g CO2 per returning visitor

11 resources served from cache · 1 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.12g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.12g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 80% cleaner ✓
vs Target 76% cleaner ✓
Image Optimization
11 images, 390 KB total, 224 KB wasted
INFO

Image Optimization Audit

Total Images

11

Total Size

390 KB

Oversized

2

Wasted

224 KB

1 missing lazy loading
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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