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 3 REVIEW

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

Transfer Efficiency

80% efficient

REVIEW

80% efficient

Transfer efficiency: 80%

An estimated 181 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 181 KB of unused JavaScript. This wasted data produces 0.04g of unnecessary CO2 per page view.

Total waste: 181 KB (20% of page weight)

Unused JS 181 KB

0.04g unnecessary CO2 per visit

Actual transfer 894 KB

Theoretical minimum 712 KB

Potential savings 181 KB (0.04g 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

0.21g CO2 per view

PASS

0.21g CO2 per view

0.21g CO2 per page view

This page transfers 0.9 MB, producing an estimated 0.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.04g, end-user device 0.16g.

Got: 0.21g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 24.8 kg CO2/year

With 10,000 page views per month, this page would generate approximately 24.8 kg of CO2 annually — equivalent to charging 3099 smartphones.

Green hosting reduces data center emissions

0.21g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.9 MB

Your site

0.21g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.04g

End-user device

0.16g

At 10,000 monthly views: Monthly: 2.1 kg · Annual: 24.8 kg · ≈ 3099 smartphone charges

A+

Repeat Visit Weight

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 14 KB (vs 894 KB first visit). 44 of 45 resources are served from browser cache, saving 0.20g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.21g)

First visit

894 KB

Repeat visit

14 KB

98% reduction on repeat visits

Saving 0.20g CO2 per returning visitor

44 resources served from cache · 1 resources re-downloaded

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.21g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 10th percentile

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

Top 10%

Target

Median website

0.21g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 66% cleaner ✓

vs Target 59% cleaner ✓

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

4 images, 194 KB total, 32 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

194 KB

Oversized

Wasted

32 KB

3 missing lazy loading

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