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

Unknown

FIX

Unknown

Hosting provider could not be identified

Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.

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 HostingUnable to Determine

Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Web Font Weight Variants

5 font weights loaded across 4 famil(y/ies)

REVIEW

5 font weights loaded across 4 famil(y/ies)

5 font weights loaded -- review whether all are used

5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: DM Sans, DM Serif Display, Elsie, Marcellus.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.41g CO2 per view

PASS

0.41g CO2 per view

0.41g CO2 per page view

This page transfers 1.4 MB, producing an estimated 0.41g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.07g, end-user device 0.26g.

Got: 0.41g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 48.9 kg CO2/year

With 10,000 page views per month, this page would generate approximately 48.9 kg of CO2 annually — equivalent to charging 6115 smartphones.

0.41g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 70% of websites

Sustainable Web Design model v4 · Page size: 1.4 MB

Your site

0.41g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.08g

Network

0.07g

End-user device

0.26g

At 10,000 monthly views: Monthly: 4.1 kg · Annual: 48.9 kg · ≈ 6115 smartphone charges

A+

Repeat Visit Weight

96% cached

PASS

96% cached

96% reduction on repeat visits

Returning visitors download only 60 KB (vs 1474 KB first visit). 59 of 62 resources are served from browser cache, saving 0.39g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.41g)

First visit

1474 KB

Repeat visit

60 KB

96% reduction on repeat visits

Saving 0.39g CO2 per returning visitor

59 resources served from cache · 3 resources re-downloaded

Carbon Budget

30th percentile

PASS

30th percentile

0.41g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 70% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 30th percentile

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

Top 10%

Target

Median website

0.41g

30th percentile

Cleaner than 70% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 32% cleaner ✓

vs Target 18% cleaner ✓

A+

Transfer Efficiency

95% efficient

PASS

95% efficient

Transfer efficiency: 95%

Only 72 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 72 KB (5% of page weight)

Unused JS 72 KB

0.02g unnecessary CO2 per visit

Actual transfer 1474 KB

Theoretical minimum 1401 KB

Potential savings 72 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

22 images, 631 KB total, 524 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

631 KB

Oversized

Wasted

524 KB

3 missing lazy loading

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