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 2 REVIEW 1 FIX

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

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 HostingNot Green Hosted

Hosting Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Web Font Weight Variants

Action

10 font weights loaded across 2 famil(y/ies)

REVIEW

10 font weights loaded across 2 famil(y/ies)

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

Loading 10 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: Cormorant Garamond, Inter.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.21g CO2 per view

PASS

0.21g CO2 per view

0.21g CO2 per page view

This page transfers 0.7 MB, producing an estimated 0.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.04g, end-user device 0.13g.

Got: 0.21g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 25.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 25.1 kg of CO2 annually — equivalent to charging 3137 smartphones.

0.21g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.7 MB

Your site

0.21g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.04g

Network

0.04g

End-user device

0.13g

At 10,000 monthly views: Monthly: 2.1 kg · Annual: 25.1 kg · ≈ 3137 smartphone charges

A+

Repeat Visit Weight

96% cached

PASS

96% cached

96% reduction on repeat visits

Returning visitors download only 28 KB (vs 756 KB first visit). 18 of 20 resources are served from browser cache, saving 0.20g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.21g)

First visit

756 KB

Repeat visit

28 KB

96% reduction on repeat visits

Saving 0.20g CO2 per returning visitor

18 resources served from cache · 2 resources re-downloaded

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.21g 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

0.21g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 65% cleaner ✓

vs Target 58% cleaner ✓

A+

Transfer Efficiency

100% efficient

PASS

100% efficient

Transfer efficiency: 100%

Only 0 KB of potential savings identified. Your page is well-optimized for size.

Actual transfer 756 KB

Theoretical minimum 756 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

17 images, 8038 KB total, 3863 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

8038 KB

Oversized

Wasted

3863 KB

13 missing alt text 17 missing dimensions 15 missing lazy loading

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