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

4 PASS 2 REVIEW 1 FIX

Transfer Efficiency

Action

38% efficient

FIX

38% efficient

Transfer efficiency: 38%

An estimated 694 KB (62%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 694 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.

Total waste: 694 KB (62% of page weight)

Unused JS 694 KB

0.16g unnecessary CO2 per visit

Actual transfer 1121 KB

Theoretical minimum 427 KB

Potential savings 694 KB (0.16g CO2)

See Deep Analysis sections above for specific optimizations.

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Loopia uses renewable energy

Loopia: 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 Loopia✓CDN Not identified✗

Loopia: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

Web Font Weight Variants

No detectable Google Fonts weights

REVIEW

No detectable Google Fonts weights

The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.

CO2 Per Page Load

0.26g CO2 per view

PASS

0.26g CO2 per view

0.26g CO2 per page view

This page transfers 1.1 MB, producing an estimated 0.26g 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: 0.26g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 31.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 31.1 kg of CO2 annually — equivalent to charging 3888 smartphones.

Green hosting reduces data center emissions

0.26g

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

0.26g

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: 2.6 kg · Annual: 31.1 kg · ≈ 3888 smartphone charges

A+

Repeat Visit Weight

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 38 KB (vs 1121 KB first visit). 41 of 44 resources are served from browser cache, saving 0.25g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.26g)

First visit

1121 KB

Repeat visit

38 KB

97% reduction on repeat visits

Saving 0.25g CO2 per returning visitor

41 resources served from cache · 3 resources re-downloaded

Carbon Budget

15th percentile

PASS

15th percentile

0.26g 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

0.26g

15th percentile

Cleaner than 85% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 57% cleaner ✓

vs Target 48% 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: Loopia

Image Optimization

10 images, 50 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

50 KB

3 missing alt text 10 missing dimensions

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