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: 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 Aruba.it✓CDN Not identified✗

Aruba.it: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

Transfer Efficiency

Action

74% efficient

REVIEW

74% efficient

Transfer efficiency: 74%

An estimated 258 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 258 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.

Total waste: 258 KB (26% of page weight)

Unused JS 258 KB

0.06g unnecessary CO2 per visit

Actual transfer 980 KB

Theoretical minimum 721 KB

Potential savings 258 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

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

0.23g CO2 per view

PASS

0.23g CO2 per view

0.23g CO2 per page view

This page transfers 1.0 MB, producing an estimated 0.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.17g.

Got: 0.23g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 27.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 27.2 kg of CO2 annually — equivalent to charging 3398 smartphones.

Green hosting reduces data center emissions

0.23g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 88% of websites

Sustainable Web Design model v4 · Page size: 1.0 MB

Your site

0.23g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.05g

End-user device

0.17g

At 10,000 monthly views: Monthly: 2.3 kg · Annual: 27.2 kg · ≈ 3398 smartphone charges

A+

Repeat Visit Weight

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 34 KB (vs 980 KB first visit). 81 of 83 resources are served from browser cache, saving 0.22g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.23g)

First visit

980 KB

Repeat visit

34 KB

97% reduction on repeat visits

Saving 0.22g CO2 per returning visitor

81 resources served from cache · 2 resources re-downloaded

Carbon Budget

12th percentile

PASS

12th percentile

0.23g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 88% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 12th percentile

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

Top 10%

Target

Median website

0.23g

12th percentile

Cleaner than 88% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 62% cleaner ✓

vs Target 55% 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: Aruba.it

Image Optimization

9 images, 227 KB total, 13 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

227 KB

Oversized

Wasted

13 KB

5 missing dimensions 5 missing lazy loading

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