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

Transfer Efficiency

78% efficient

REVIEW

78% efficient

Transfer efficiency: 78%

An estimated 119 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 119 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.

Total waste: 119 KB (22% of page weight)

Unused JS 119 KB

0.03g unnecessary CO2 per visit

Actual transfer 539 KB

Theoretical minimum 420 KB

Potential savings 119 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

Web Font Weight Variants

Action

11 font weights loaded across 8 famil(y/ies)

REVIEW

11 font weights loaded across 8 famil(y/ies)

11 font weights loaded -- likely 100+ KB of unused payload

Loading 11 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Archivo Black, Bodoni Moda, DM Serif Display, Fraunces, Geist, Instrument Serif, JetBrains Mono, Manrope.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

CO2 Per Page Load

0.12g CO2 per view

PASS

0.12g CO2 per view

0.12g CO2 per page view

This page transfers 0.5 MB, producing an estimated 0.12g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.03g, end-user device 0.10g.

Got: 0.12g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 15.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 15.0 kg of CO2 annually — equivalent to charging 1872 smartphones.

Green hosting reduces data center emissions

0.12g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.5 MB

Your site

0.12g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.00g

Network

0.03g

End-user device

0.10g

At 10,000 monthly views: Monthly: 1.2 kg · Annual: 15.0 kg · ≈ 1872 smartphone charges

Green Hosting

Green (cdn)

PASS

Green (cdn)

Cloudflare CDN uses renewable energy

Since most traffic is served through the CDN, the majority of data transfer energy is renewable.

Cloudflare: 100% renewable energy for global network since 2019

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 Not identified✗CDN Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 11 KB (vs 539 KB first visit). 63 of 64 resources are served from browser cache, saving 0.12g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.12g)

First visit

539 KB

Repeat visit

11 KB

98% reduction on repeat visits

Saving 0.12g CO2 per returning visitor

63 resources served from cache · 1 resources re-downloaded

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.12g 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

0.12g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 79% cleaner ✓

vs Target 75% cleaner ✓

Image Optimization

7 images, 423 KB total, 127 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

423 KB

Oversized

Wasted

127 KB

7 missing dimensions 2 missing lazy loading

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