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

88% efficient

REVIEW

88% efficient

Transfer efficiency: 88%

An estimated 144 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 144 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.

Total waste: 144 KB (12% of page weight)

Unused JS 144 KB

0.03g unnecessary CO2 per visit

Actual transfer 1195 KB

Theoretical minimum 1050 KB

Potential savings 144 KB (0.03g 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

0.28g CO2 per view

PASS

0.28g CO2 per view

0.28g CO2 per page view

This page transfers 1.2 MB, producing an estimated 0.28g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.21g.

Got: 0.28g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 33.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 33.2 kg of CO2 annually — equivalent to charging 4145 smartphones.

Green hosting reduces data center emissions

0.28g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 83% of websites

Sustainable Web Design model v4 · Page size: 1.2 MB

Your site

0.28g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.06g

End-user device

0.21g

At 10,000 monthly views: Monthly: 2.8 kg · Annual: 33.2 kg · ≈ 4145 smartphone charges

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Vercel, CDN: Vercel

Vercel: Hosted on AWS/Google Cloud with renewable energy commitments

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 Vercel✓CDN Vercel✓

Vercel: Hosted on AWS/Google Cloud with renewable energy commitments

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 2 KB (vs 1195 KB first visit). 26 of 27 resources are served from browser cache, saving 0.28g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.28g)

First visit

1195 KB

Repeat visit

2 KB

100% reduction on repeat visits

Saving 0.28g CO2 per returning visitor

26 resources served from cache · 1 resources re-downloaded

Carbon Budget

17th percentile

PASS

17th percentile

0.28g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 83% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 17th percentile

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

Top 10%

Target

Median website

0.28g

17th percentile

Cleaner than 83% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 54% cleaner ✓

vs Target 45% cleaner ✓

A+

Web Font Weight Variants

2 font weights loaded across 2 famil(y/ies) -- reasonable

PASS

2 font weights loaded across 2 famil(y/ies) -- reasonable

2 font weight(s) loaded across 2 famil(y/ies)

Image Optimization

18 images, 138 KB total, 22 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

138 KB

Oversized

Wasted

22 KB

18 missing dimensions 6 missing lazy loading

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