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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
82
GRADE
B
FIX
1
REVIEW
0
PASS
5
INFO
0
Device:
Mobile Desktop
Checks
6
5 PASS 1 FIX
D
Transfer Efficiency
Action
56% efficient
FIX
56% efficient
Warning::
Transfer efficiency: 56%
An estimated 727 KB (44%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 727 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
56% efficient

Total waste: 727 KB (44% of page weight)

Unused JS 727 KB

0.17g unnecessary CO2 per visit

Actual transfer 1635 KB
Theoretical minimum 908 KB
Potential savings 727 KB (0.17g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.38g CO2 per view
PASS
0.38g CO2 per view
Info::
0.38g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.38g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.29g.
Got: 0.38g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 45.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 45.4 kg of CO2 annually — equivalent to charging 5670 smartphones.
Info::
Green hosting reduces data center emissions

0.38g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 73% of websites

Sustainable Web Design model v4 · Page size: 1.6 MB

Your site
0.38g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 3.8 kg · Annual: 45.4 kg · ≈ 5670 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Snowplow Analytics, CDN: Cloudflare
Info::
Snowplow Analytics: Verified by the Green Web Foundation
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 Snowplow Analytics✓CDN Cloudflare✓

Snowplow Analytics: Verified by the Green Web Foundation

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 16 KB (vs 1635 KB first visit). 49 of 50 resources are served from browser cache, saving 0.37g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.38g)
First visit
1635 KB
Repeat visit
16 KB

99% reduction on repeat visits

Saving 0.37g CO2 per returning visitor

49 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
27th percentile
PASS
27th percentile
Info::
0.38g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 73% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 27th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.38g

27th percentile

Cleaner than 73% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 37% cleaner ✓
vs Target 24% cleaner ✓
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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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