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

Action

16 font weights loaded across 1 famil(y/ies)

REVIEW

16 font weights loaded across 1 famil(y/ies)

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

Loading 16 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: Montserrat.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.35g CO2 per view

PASS

0.35g CO2 per view

0.35g CO2 per page view

This page transfers 1.2 MB, producing an estimated 0.35g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.06g, end-user device 0.22g.

Got: 0.35g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 41.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 41.7 kg of CO2 annually — equivalent to charging 5217 smartphones.

0.35g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 76% of websites

Sustainable Web Design model v4 · Page size: 1.2 MB

Your site

0.35g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.06g

Network

0.06g

End-user device

0.22g

At 10,000 monthly views: Monthly: 3.5 kg · Annual: 41.7 kg · ≈ 5217 smartphone charges

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 9 KB (vs 1257 KB first visit). 26 of 27 resources are served from browser cache, saving 0.35g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.35g)

First visit

1257 KB

Repeat visit

9 KB

99% reduction on repeat visits

Saving 0.35g CO2 per returning visitor

26 resources served from cache · 1 resources re-downloaded

Carbon Budget

24th percentile

PASS

24th percentile

0.35g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 76% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 24th percentile

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

Top 10%

Target

Median website

0.35g

24th percentile

Cleaner than 76% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 42% cleaner ✓

vs Target 30% cleaner ✓

A+

Transfer Efficiency

98% efficient

PASS

98% efficient

Transfer efficiency: 98%

Only 21 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 21 KB (2% of page weight)

Unused JS 21 KB

0.01g unnecessary CO2 per visit

Actual transfer 1257 KB

Theoretical minimum 1236 KB

Potential savings 21 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

11 images, 146 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

146 KB

11 missing dimensions 5 missing lazy loading

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