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 1 REVIEW 1 FIX

Transfer Efficiency

Action

54% efficient

FIX

54% efficient

Transfer efficiency: 54%

An estimated 544 KB (46%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 544 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.

Total waste: 544 KB (46% of page weight)

Unused JS 544 KB

0.13g unnecessary CO2 per visit

Actual transfer 1195 KB

Theoretical minimum 650 KB

Potential savings 544 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

Web Font Weight Variants

Action

9 font weights loaded across 3 famil(y/ies)

REVIEW

9 font weights loaded across 3 famil(y/ies)

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

Loading 9 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: IBM Plex Mono, Inter, Inter Tight.

CO2 Per Page Load

0.28g CO2 per view

PASS

0.28g CO2 per view

0.28g CO2 per page view

This page transfers 1.2 MB, producing an estimated 0.28g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.21g.

Got: 0.28g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 33.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 33.2 kg of CO2 annually — equivalent to charging 4145 smartphones.

Green hosting reduces data center emissions

0.28g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 83% of websites

Sustainable Web Design model v4 · Page size: 1.2 MB

Your site

0.28g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.06g

End-user device

0.21g

At 10,000 monthly views: Monthly: 2.8 kg · Annual: 33.2 kg · ≈ 4145 smartphone charges

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Cloudflare, CDN: Cloudflare

Cloudflare: Verified by the Green Web Foundation

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 Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

96% cached

PASS

96% cached

96% reduction on repeat visits

Returning visitors download only 43 KB (vs 1195 KB first visit). 48 of 50 resources are served from browser cache, saving 0.27g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.28g)

First visit

1195 KB

Repeat visit

43 KB

96% reduction on repeat visits

Saving 0.27g CO2 per returning visitor

48 resources served from cache · 2 resources re-downloaded

Carbon Budget

17th percentile

PASS

17th percentile

0.28g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 83% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 17th percentile

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

Top 10%

Target

Median website

0.28g

17th percentile

Cleaner than 83% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 54% cleaner ✓

vs Target 45% 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: Cloudflare

Image Optimization

2 images, 244 KB total, 119 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

244 KB

Oversized

Wasted

119 KB

1 missing dimensions 1 missing lazy loading

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