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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
78
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
8
3 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.93g CO2 per view
FIX
0.93g CO2 per view
Info::
0.93g CO2 per page view
This page transfers 3.9 MB, producing an estimated 0.93g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.19g, end-user device 0.71g.
Got: 0.93g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 111.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 111.7 kg of CO2 annually — equivalent to charging 13961 smartphones.
Info::
Green hosting reduces data center emissions

0.93g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 41% of websites

Sustainable Web Design model v4 · Page size: 3.9 MB

Your site
0.93g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.19g
End-user device
0.71g
At 10,000 monthly views: Monthly: 9.3 kg · Annual: 111.7 kg · ≈ 13961 smartphone charges
D
Carbon Budget
Action
59th percentile
FIX
59th percentile
Warning::
0.93g CO2 — above the median website (0.60g)
Heavier than an estimated 41% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 59th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.93g

59th percentile

Cleaner than 41% of websites

Above the median website

vs Median 55% more
vs Target 86% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 438 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 438 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
89% efficient

Total waste: 438 KB (11% of page weight)

Unused JS 438 KB

0.10g unnecessary CO2 per visit

Actual transfer 4026 KB
Theoretical minimum 3588 KB
Potential savings 438 KB (0.10g CO2)

See Deep Analysis sections above for specific optimizations.

C
Web Font Weight Variants
Action
9 font weights loaded across 1 famil(y/ies)
REVIEW
9 font weights loaded across 1 famil(y/ies)
Warning::
9 font weights loaded -- likely 100+ KB of unused payload
Loading 9 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: Urbanist.
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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 31 KB (vs 4026 KB first visit). 133 of 135 resources are served from browser cache, saving 0.92g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.93g)
First visit
4026 KB
Repeat visit
31 KB

99% reduction on repeat visits

Saving 0.92g CO2 per returning visitor

133 resources served from cache · 2 resources re-downloaded

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
40 images, 908 KB total, 149 KB wasted
INFO

Image Optimization Audit

Total Images

40

Total Size

908 KB

Oversized

8

Wasted

149 KB

10 missing dimensions 29 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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