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

Action

67% efficient

REVIEW

67% efficient

Transfer efficiency: 67%

An estimated 509 KB (33%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 509 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.

Total waste: 509 KB (33% of page weight)

Unused JS 509 KB

0.12g unnecessary CO2 per visit

Actual transfer 1535 KB

Theoretical minimum 1025 KB

Potential savings 509 KB (0.12g 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

0.35g CO2 per view

PASS

0.35g CO2 per view

0.35g CO2 per page view

This page transfers 1.5 MB, producing an estimated 0.35g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.27g.

Got: 0.35g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 42.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 42.6 kg of CO2 annually — equivalent to charging 5323 smartphones.

Green hosting reduces data center emissions

0.35g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 75% of websites

Sustainable Web Design model v4 · Page size: 1.5 MB

Your site

0.35g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.07g

End-user device

0.27g

At 10,000 monthly views: Monthly: 3.5 kg · Annual: 42.6 kg · ≈ 5323 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 Express✗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

99% reduction on repeat visits

Returning visitors download only 18 KB (vs 1535 KB first visit). 89 of 90 resources are served from browser cache, saving 0.35g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.35g)

First visit

1535 KB

Repeat visit

18 KB

99% reduction on repeat visits

Saving 0.35g CO2 per returning visitor

89 resources served from cache · 1 resources re-downloaded

Carbon Budget

25th percentile

PASS

25th percentile

0.35g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 75% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 25th percentile

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

Top 10%

Target

Median website

0.35g

25th percentile

Cleaner than 75% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 41% cleaner ✓

vs Target 29% cleaner ✓

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

48 images, 319 KB total, 240 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

319 KB

Oversized

Wasted

240 KB

26 missing dimensions 2 missing lazy loading

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