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

3 PASS 2 REVIEW 2 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

Repeat Visit Weight

Action

38% cached

FIX

38% cached

Only 38% reduction on repeat visits

Returning visitors still download 171 KB — only 38% less than the first visit (277 KB). 1 resources lack proper caching headers. See the Performance tab's HTTP Caching section for specific recommendations.

Repeat visit: 0.05g CO2 (first visit: 0.08g)

First visit

277 KB

Repeat visit

171 KB

38% reduction on repeat visits

Saving 0.03g CO2 per returning visitor

14 resources served from cache · 1 resources re-downloaded

Web Font Weight Variants

Action

8 font weights loaded across 3 famil(y/ies)

REVIEW

8 font weights loaded across 3 famil(y/ies)

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

Loading 8 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: IBM Plex Mono, IBM Plex Sans, Space Grotesk.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

CO2 Per Page Load

0.08g CO2 per view

PASS

0.08g CO2 per view

0.08g CO2 per page view

This page transfers 0.3 MB, producing an estimated 0.08g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.01g, end-user device 0.05g.

Got: 0.08g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 9.2 kg CO2/year

With 10,000 page views per month, this page would generate approximately 9.2 kg of CO2 annually — equivalent to charging 1150 smartphones.

0.08g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.3 MB

Your site

0.08g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.01g

End-user device

0.05g

At 10,000 monthly views: Monthly: 0.8 kg · Annual: 9.2 kg · ≈ 1150 smartphone charges

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.08g 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

0.08g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 87% cleaner ✓

vs Target 85% 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 277 KB

Theoretical minimum 277 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

6 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

2 missing dimensions 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.