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

1.54g CO2 per view

FIX

1.54g CO2 per view

1.54g CO2 per page view

This page transfers 5.4 MB, producing an estimated 1.54g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.27g, end-user device 0.99g.

Got: 1.54g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 184.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 184.4 kg of CO2 annually — equivalent to charging 23050 smartphones.

1.54g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 24% of websites

Sustainable Web Design model v4 · Page size: 5.4 MB

Your site

1.54g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.28g

Network

0.27g

End-user device

0.99g

At 10,000 monthly views: Monthly: 15.4 kg · Annual: 184.4 kg · ≈ 23050 smartphone charges

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

Carbon Budget

Action

76th percentile

FIX

76th percentile

1.54g CO2 — above the median website (0.60g)

Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 76th percentile

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

Top 10%

Target

Median website

1.54g

76th percentile

Cleaner than 24% of websites

✗ Above the median website

vs Median 156% more

vs Target 207% 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 18 KB (vs 5556 KB first visit). 72 of 74 resources are served from browser cache, saving 1.53g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 1.54g)

First visit

5556 KB

Repeat visit

18 KB

100% reduction on repeat visits

Saving 1.53g CO2 per returning visitor

72 resources served from cache · 2 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 5556 KB

Theoretical minimum 5556 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

42 images, 6339 KB total, 3314 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

6339 KB

Oversized

Wasted

3314 KB

3 missing alt text 32 missing dimensions 38 missing lazy loading

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