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

5 PASS 2 REVIEW

Web Font Weight Variants

Action

11 font weights loaded across 2 famil(y/ies)

REVIEW

11 font weights loaded across 2 famil(y/ies)

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

Loading 11 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: Outfit, 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

0.11g CO2 per view

PASS

0.11g CO2 per view

0.11g CO2 per page view

This page transfers 0.5 MB, producing an estimated 0.11g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.02g, end-user device 0.08g.

Got: 0.11g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 13.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 13.1 kg of CO2 annually — equivalent to charging 1632 smartphones.

Green hosting reduces data center emissions

0.11g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.5 MB

Your site

0.11g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.00g

Network

0.02g

End-user device

0.08g

At 10,000 monthly views: Monthly: 1.1 kg · Annual: 13.1 kg · ≈ 1632 smartphone charges

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: GitHub Pages, CDN: GitHub Pages

GitHub Pages: Hosted on Azure/GitHub with Microsoft carbon-negative commitment

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 Hosting✓ Green Hosted

Hosting GitHub Pages✓CDN GitHub Pages✓

GitHub Pages: Hosted on Azure/GitHub with Microsoft carbon-negative commitment

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 7 KB (vs 470 KB first visit). 11 of 12 resources are served from browser cache, saving 0.11g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.11g)

First visit

470 KB

Repeat visit

7 KB

99% reduction on repeat visits

Saving 0.11g CO2 per returning visitor

11 resources served from cache · 1 resources re-downloaded

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.11g 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

0.11g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 82% cleaner ✓

vs Target 78% 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 470 KB

Theoretical minimum 470 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

2 images, 221 KB total, 110 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

221 KB

Oversized

Wasted

110 KB

2 missing dimensions 1 missing lazy loading

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