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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
67
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
4.21g CO2 per view
FIX
4.21g CO2 per view
Critical::
4.21g CO2 per page view
This page transfers 17.8 MB, producing an estimated 4.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.87g, end-user device 3.23g.
Got: 4.21g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 505.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 505.0 kg of CO2 annually — equivalent to charging 63129 smartphones.
Info::
Green hosting reduces data center emissions

4.21g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 17.8 MB

Your site
4.21g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.11g
Network
0.87g
End-user device
3.23g
At 10,000 monthly views: Monthly: 42.1 kg · Annual: 505.0 kg · ≈ 63129 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.21g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

4.21g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 601% more
vs Target 742% more
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
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Netlify CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Netlify: Hosted on AWS/Google Cloud with renewable energy matching
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 Not identified✗CDN Netlify✓

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 4 KB (vs 18208 KB first visit). 20 of 21 resources are served from browser cache, saving 4.21g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 4.21g)
First visit
18208 KB
Repeat visit
4 KB

100% reduction on repeat visits

Saving 4.21g CO2 per returning visitor

20 resources served from cache · 1 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 18208 KB
Theoretical minimum 18208 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization
11 images, 18108 KB total, 16978 KB wasted
INFO

Image Optimization Audit

Total Images

11

Total Size

18108 KB

Oversized

11

Wasted

16978 KB

10 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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