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

3 PASS 4 REVIEW

CO2 Per Page Load

0.62g CO2 per view

REVIEW

0.62g CO2 per view

0.62g CO2 per page view

This page transfers 2.6 MB, producing an estimated 0.62g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.13g, end-user device 0.48g.

Got: 0.62g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 74.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 74.6 kg of CO2 annually — equivalent to charging 9326 smartphones.

Green hosting reduces data center emissions

0.62g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 50% of websites

Sustainable Web Design model v4 · Page size: 2.6 MB

Your site

0.62g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.13g

End-user device

0.48g

At 10,000 monthly views: Monthly: 6.2 kg · Annual: 74.6 kg · ≈ 9326 smartphone charges

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Previder BV uses renewable energy

Previder BV: Verified by the Green Web Foundation

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 Previder BV✓CDN Not identified✗

Previder BV: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

50th percentile

REVIEW

50th percentile

0.62g CO2 — above the median website (0.60g)

Heavier than an estimated 50% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 50th percentile

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

Top 10%

Target

Median website

0.62g

50th percentile

Cleaner than 50% of websites

✗ Above the median website

vs Median 4% more

vs Target 24% more

Transfer Efficiency

79% efficient

REVIEW

79% efficient

Transfer efficiency: 79%

An estimated 554 KB (21%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 554 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.

Total waste: 554 KB (21% of page weight)

Unused JS 554 KB

0.13g unnecessary CO2 per visit

Actual transfer 2689 KB

Theoretical minimum 2135 KB

Potential savings 554 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 35 KB (vs 2689 KB first visit). 53 of 54 resources are served from browser cache, saving 0.61g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.62g)

First visit

2689 KB

Repeat visit

35 KB

99% reduction on repeat visits

Saving 0.61g CO2 per returning visitor

53 resources served from cache · 1 resources re-downloaded

A+

Web Font Weight Variants

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

PASS

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

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

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Previder BV

Image Optimization

9 images, 357 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

357 KB

Oversized

5 missing dimensions 8 missing lazy loading

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