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

2 PASS 2 REVIEW 3 FIX

CO2 Per Page Load

Action

4.75g CO2 per view

FIX

4.75g CO2 per view

4.75g CO2 per page view

This page transfers 16.8 MB, producing an estimated 4.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.88g, network 0.82g, end-user device 3.05g.

Got: 4.75g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 570.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 570.3 kg of CO2 annually — equivalent to charging 71291 smartphones.

4.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 16.8 MB

Your site

4.75g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.88g

Network

0.82g

End-user device

3.05g

At 10,000 monthly views: Monthly: 47.5 kg · Annual: 570.3 kg · ≈ 71291 smartphone charges

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

Carbon Budget

Action

95th percentile

FIX

95th percentile

4.75g CO2 — above the median website (0.60g)

Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 95th percentile

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

Top 10%

Target

Median website

4.75g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 692% more

vs Target 851% more

Web Font Weight Variants

No detectable Google Fonts weights

REVIEW

No detectable Google Fonts weights

The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 6 KB (vs 17185 KB first visit). 185 of 186 resources are served from browser cache, saving 4.75g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 4.75g)

First visit

17185 KB

Repeat visit

6 KB

100% reduction on repeat visits

Saving 4.75g CO2 per returning visitor

185 resources served from cache · 1 resources re-downloaded

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 17185 KB

Theoretical minimum 17185 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

155 images, 16853 KB total, 6318 KB wasted

INFO

Image Optimization Audit

Total Images

155

Total Size

16853 KB

Oversized

Wasted

6318 KB

155 missing dimensions 154 missing lazy loading

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