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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
93
GRADE
A
FIX
0
REVIEW
3
PASS
4
INFO
1
Checks
8
4 PASS 3 REVIEW
B
CO2 Per Page Load
0.53g CO2 per view
REVIEW
0.53g CO2 per view
Info::
0.53g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.53g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.40g.
Got: 0.53g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 63.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 63.2 kg of CO2 annually — equivalent to charging 7901 smartphones.
Info::
Green hosting reduces data center emissions

0.53g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 58% of websites

Sustainable Web Design model v4 · Page size: 2.2 MB

Your site
0.53g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.11g
End-user device
0.40g
At 10,000 monthly views: Monthly: 5.3 kg · Annual: 63.2 kg · ≈ 7901 smartphone charges
B
Carbon Budget
42th percentile
REVIEW
42th percentile
Info::
0.53g CO2 — below the median website (0.60g)
Better than an estimated 58% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 42th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.53g

42nd percentile

Cleaner than 58% of websites

Above the median website

vs Median 12% cleaner ✓
vs Target 5% more
B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
No detectable Google Fonts weights
Info::
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.
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: 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 Next.jsCDN Cloudflare

Next.js: 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 53 KB (vs 2279 KB first visit). 129 of 130 resources are served from browser cache, saving 0.51g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.53g)
First visit
2279 KB
Repeat visit
53 KB

98% reduction on repeat visits

Saving 0.51g CO2 per returning visitor

129 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 74 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 74 KB (3% of page weight)

Unused JS 74 KB

0.02g unnecessary CO2 per visit

Actual transfer 2279 KB
Theoretical minimum 2204 KB
Potential savings 74 KB (0.02g 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
75 images, 957 KB total, 511 KB wasted
INFO

Image Optimization Audit

Total Images

75

Total Size

957 KB

Oversized

6

Wasted

511 KB

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.

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