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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
92
GRADE
A
FIX
0
REVIEW
1
PASS
6
INFO
1
Checks
8
6 PASS 1 REVIEW
B
Web Font Weight Variants
5 font weights loaded across 2 famil(y/ies)
REVIEW
5 font weights loaded across 2 famil(y/ies)
Info::
5 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Inter, Manrope.
A
CO2 Per Page Load
0.30g CO2 per view
PASS
0.30g CO2 per view
Info::
0.30g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.23g.
Got: 0.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 36.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 36.3 kg of CO2 annually — equivalent to charging 4543 smartphones.
Info::
Green hosting reduces data center emissions

0.30g

Carbon Footprint per page view

Below sustainability target (0.50g)

Cleaner than 80% of websites

Sustainable Web Design model v4 · Page size: 1.3 MB

Your site
0.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.06g
End-user device
0.23g
At 10,000 monthly views: Monthly: 3.0 kg · Annual: 36.3 kg · ≈ 4543 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
Info::
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 CloudflareCDN Cloudflare

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
85% cached
PASS
85% cached
Info::
85% reduction on repeat visits
Returning visitors download only 195 KB (vs 1310 KB first visit). 36 of 37 resources are served from browser cache, saving 0.26g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.30g)
First visit
1310 KB
Repeat visit
195 KB

85% reduction on repeat visits

Saving 0.26g CO2 per returning visitor

36 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
20th percentile
PASS
20th percentile
Info::
0.30g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 80% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 20th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.30g

20th percentile

Cleaner than 80% of websites

Below the Web Sustainability Guidelines target

vs Median 50% cleaner ✓
vs Target 39% cleaner ✓
A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 26 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 26 KB (2% of page weight)

Unused JS 26 KB

0.01g unnecessary CO2 per visit

Actual transfer 1310 KB
Theoretical minimum 1283 KB
Potential savings 26 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Image Optimization
14 images, 1436 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

14

Total Size

1436 KB

14 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.

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