Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

5 PASS 2 REVIEW

Transfer Efficiency

80% efficient

REVIEW

80% efficient

Transfer efficiency: 80%

An estimated 223 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 223 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.

Total waste: 223 KB (20% of page weight)

Unused JS 223 KB

0.05g unnecessary CO2 per visit

Actual transfer 1100 KB

Theoretical minimum 877 KB

Potential savings 223 KB (0.05g CO2)

See Deep Analysis sections above for specific optimizations.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.25g CO2 per view

PASS

0.25g CO2 per view

0.25g CO2 per page view

This page transfers 1.1 MB, producing an estimated 0.25g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.20g.

Got: 0.25g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 30.5 kg CO2/year

With 10,000 page views per month, this page would generate approximately 30.5 kg of CO2 annually — equivalent to charging 3814 smartphones.

Green hosting reduces data center emissions

0.25g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 85% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site

0.25g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.05g

End-user device

0.20g

At 10,000 monthly views: Monthly: 2.5 kg · Annual: 30.5 kg · ≈ 3814 smartphone charges

Green Hosting

Green (cdn)

PASS

Green (cdn)

Cloudflare CDN uses renewable energy

Since most traffic is served through the CDN, the majority of data transfer energy is renewable.

Cloudflare: 100% renewable energy for global network since 2019

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

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 29 KB (vs 1100 KB first visit). 35 of 39 resources are served from browser cache, saving 0.25g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.25g)

First visit

1100 KB

Repeat visit

29 KB

97% reduction on repeat visits

Saving 0.25g CO2 per returning visitor

35 resources served from cache · 4 resources re-downloaded

Carbon Budget

15th percentile

PASS

15th percentile

0.25g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 85% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 15th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

0.25g

15th percentile

Cleaner than 85% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 58% cleaner ✓

vs Target 49% cleaner ✓

A+

Web Font Weight Variants

1 font weights loaded across 1 famil(y/ies) -- reasonable

PASS

1 font weights loaded across 1 famil(y/ies) -- reasonable

1 font weight(s) loaded across 1 famil(y/ies)

Image Optimization

12 images, 226 KB total, 14 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

226 KB

Oversized

Wasted

14 KB

4 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.