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

52% efficient

FIX

52% efficient

Transfer efficiency: 52%

An estimated 678 KB (48%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 678 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.

Total waste: 678 KB (48% of page weight)

Unused JS 678 KB

0.16g unnecessary CO2 per visit

Actual transfer 1410 KB

Theoretical minimum 732 KB

Potential savings 678 KB (0.16g 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

0.33g CO2 per view

PASS

0.33g CO2 per view

0.33g CO2 per page view

This page transfers 1.4 MB, producing an estimated 0.33g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.25g.

Got: 0.33g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 39.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 39.1 kg of CO2 annually — equivalent to charging 4888 smartphones.

Green hosting reduces data center emissions

0.33g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 78% of websites

Sustainable Web Design model v4 · Page size: 1.4 MB

Your site

0.33g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.07g

End-user device

0.25g

At 10,000 monthly views: Monthly: 3.3 kg · Annual: 39.1 kg · ≈ 4888 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

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 43 KB (vs 1410 KB first visit). 55 of 57 resources are served from browser cache, saving 0.32g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.33g)

First visit

1410 KB

Repeat visit

43 KB

97% reduction on repeat visits

Saving 0.32g CO2 per returning visitor

55 resources served from cache · 2 resources re-downloaded

Carbon Budget

22th percentile

PASS

22th percentile

0.33g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 78% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 22th percentile

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

Top 10%

Target

Median website

0.33g

22nd percentile

Cleaner than 78% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 46% cleaner ✓

vs Target 35% 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.