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https://seijakumatcha.co.uk

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
79
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.30g CO2 per view
FIX
1.30g CO2 per view
Warning::
1.30g CO2 per page view
This page transfers 5.5 MB, producing an estimated 1.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.27g, end-user device 1.00g.
Got: 1.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 155.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 155.6 kg of CO2 annually — equivalent to charging 19445 smartphones.
Info::
Green hosting reduces data center emissions

1.30g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 31% of websites

Sustainable Web Design model v4 · Page size: 5.5 MB

Your site
1.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.27g
End-user device
1.00g
At 10,000 monthly views: Monthly: 13.0 kg · Annual: 155.6 kg · ≈ 19445 smartphone charges
D
Carbon Budget
Action
69th percentile
FIX
69th percentile
Warning::
1.30g CO2 — above the median website (0.60g)
Heavier than an estimated 31% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 69th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.30g

69th percentile

Cleaner than 31% of websites

✗ Above the median website

vs Median 116% more
vs Target 159% 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::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 62 KB (vs 5608 KB first visit). 126 of 127 resources are served from browser cache, saving 1.28g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.30g)
First visit
5608 KB
Repeat visit
62 KB

99% reduction on repeat visits

Saving 1.28g CO2 per returning visitor

126 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 215 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 215 KB (4% of page weight)

Unused JS 215 KB

0.05g unnecessary CO2 per visit

Actual transfer 5608 KB
Theoretical minimum 5392 KB
Potential savings 215 KB (0.05g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
1 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

0 KB

1 missing dimensions 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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