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

2 PASS 5 REVIEW

CO2 Per Page Load

0.59g CO2 per view

REVIEW

0.59g CO2 per view

0.59g CO2 per page view

This page transfers 2.5 MB, producing an estimated 0.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.46g.

Got: 0.59g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 71.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 71.3 kg of CO2 annually — equivalent to charging 8916 smartphones.

Green hosting reduces data center emissions

0.59g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 51% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site

0.59g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.12g

End-user device

0.46g

At 10,000 monthly views: Monthly: 5.9 kg · Annual: 71.3 kg · ≈ 8916 smartphone charges

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Aruba.it uses renewable energy

Aruba.it: Listed in the Green Web Foundation dataset

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 Aruba.it✓CDN Not identified✗

Aruba.it: Listed in the Green Web Foundation dataset

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

49th percentile

REVIEW

49th percentile

0.59g CO2 — below the median website (0.60g)

Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 49th percentile

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

Top 10%

Target

Median website

0.59g

49th percentile

Cleaner than 51% of websites

✗ Above the median website

vs Median 1% cleaner ✓

vs Target 19% more

Transfer Efficiency

Action

61% efficient

REVIEW

61% efficient

Transfer efficiency: 61%

An estimated 999 KB (39%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 999 KB of unused JavaScript. This wasted data produces 0.23g of unnecessary CO2 per page view.

Total waste: 999 KB (39% of page weight)

Unused JS 999 KB

0.23g unnecessary CO2 per visit

Actual transfer 2571 KB

Theoretical minimum 1572 KB

Potential savings 999 KB (0.23g 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

A+

Repeat Visit Weight

95% cached

PASS

95% cached

95% reduction on repeat visits

Returning visitors download only 140 KB (vs 2571 KB first visit). 115 of 126 resources are served from browser cache, saving 0.56g CO2 per repeat visit.

Repeat visit: 0.03g CO2 (first visit: 0.59g)

First visit

2571 KB

Repeat visit

140 KB

95% reduction on repeat visits

Saving 0.56g CO2 per returning visitor

115 resources served from cache · 11 resources re-downloaded

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

30 images, 57 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

57 KB

28 missing dimensions 27 missing lazy loading

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