https://www.dentistwandsworth.co.uk/invisalign-i7

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

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Hetzner Online GmbH uses renewable energy

Hetzner Online GmbH: 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 Hetzner Online GmbH✓CDN Not identified✗

Hetzner Online GmbH: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

Transfer Efficiency

Action

68% efficient

REVIEW

68% efficient

Transfer efficiency: 68%

An estimated 551 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 551 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.

Total waste: 551 KB (32% of page weight)

Unused JS 551 KB

0.13g unnecessary CO2 per visit

Actual transfer 1709 KB

Theoretical minimum 1157 KB

Potential savings 551 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

CO2 Per Page Load

0.40g CO2 per view

PASS

0.40g CO2 per view

0.40g CO2 per page view

This page transfers 1.7 MB, producing an estimated 0.40g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.30g.

Got: 0.40g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 47.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 47.4 kg of CO2 annually — equivalent to charging 5926 smartphones.

Green hosting reduces data center emissions

0.40g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 71% of websites

Sustainable Web Design model v4 · Page size: 1.7 MB

Your site

0.40g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.08g

End-user device

0.30g

At 10,000 monthly views: Monthly: 4.0 kg · Annual: 47.4 kg · ≈ 5926 smartphone charges

A+

Repeat Visit Weight

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 39 KB (vs 1709 KB first visit). 73 of 75 resources are served from browser cache, saving 0.39g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.40g)

First visit

1709 KB

Repeat visit

39 KB

98% reduction on repeat visits

Saving 0.39g CO2 per returning visitor

73 resources served from cache · 2 resources re-downloaded

Carbon Budget

29th percentile

PASS

29th percentile

0.40g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 71% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 29th percentile

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

Top 10%

Target

Median website

0.40g

29th percentile

Cleaner than 71% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 34% cleaner ✓

vs Target 21% cleaner ✓

A+

Web Font Weight Variants

3 font weights loaded across 2 famil(y/ies) -- reasonable

PASS

3 font weights loaded across 2 famil(y/ies) -- reasonable

3 font weight(s) loaded across 2 famil(y/ies)

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Hetzner Online GmbH

Image Optimization

31 images, 309 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

309 KB

22 missing dimensions 25 missing lazy loading

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