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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
88
GRADE
B
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
8
3 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.17g CO2 per view
FIX
1.17g CO2 per view
Warning::
1.17g CO2 per page view
This page transfers 5.0 MB, producing an estimated 1.17g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.24g, end-user device 0.90g.
Got: 1.17g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 140.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 140.9 kg of CO2 annually — equivalent to charging 17609 smartphones.
Info::
Green hosting reduces data center emissions

1.17g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 34% of websites

Sustainable Web Design model v4 · Page size: 5.0 MB

Your site
1.17g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.24g
End-user device
0.90g
At 10,000 monthly views: Monthly: 11.7 kg · Annual: 140.9 kg · ≈ 17609 smartphone charges
D
Carbon Budget
Action
66th percentile
FIX
66th percentile
Warning::
1.17g CO2 — above the median website (0.60g)
Heavier than an estimated 34% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 66th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.17g

66th percentile

Cleaner than 34% of websites

✗ Above the median website

vs Median 96% more
vs Target 135% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: 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 Google Cloud✓CDN Not identified✗

Google Cloud: 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 66 KB (vs 5079 KB first visit). 201 of 205 resources are served from browser cache, saving 1.16g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.17g)
First visit
5079 KB
Repeat visit
66 KB

99% reduction on repeat visits

Saving 1.16g CO2 per returning visitor

201 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 265 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 265 KB (5% of page weight)

Unused JS 265 KB

0.06g unnecessary CO2 per visit

Actual transfer 5079 KB
Theoretical minimum 4813 KB
Potential savings 265 KB (0.06g CO2)

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: Google Cloud

Image Optimization
86 images, 1204 KB total, 1027 KB wasted
INFO

Image Optimization Audit

Total Images

86

Total Size

1204 KB

Oversized

6

Wasted

1027 KB

5 missing dimensions 7 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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