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https://jluxlabel.com

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
68
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.54g CO2 per view
FIX
2.54g CO2 per view
Critical::
2.54g CO2 per page view
This page transfers 10.7 MB, producing an estimated 2.54g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.53g, end-user device 1.95g.
Got: 2.54g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 305.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 305.3 kg of CO2 annually — equivalent to charging 38162 smartphones.
Info::
Green hosting reduces data center emissions

2.54g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.7 MB

Your site
2.54g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.53g
End-user device
1.95g
At 10,000 monthly views: Monthly: 25.4 kg · Annual: 305.3 kg · ≈ 38162 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.54g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.54g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 324% more
vs Target 409% more
B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 1937 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1937 KB of unused JavaScript. This wasted data produces 0.45g of unnecessary CO2 per page view.
82% efficient

Total waste: 1937 KB (18% of page weight)

Unused JS 1937 KB

0.45g unnecessary CO2 per visit

Actual transfer 11007 KB
Theoretical minimum 9069 KB
Potential savings 1937 KB (0.45g CO2)

See Deep Analysis sections above for specific optimizations.

B
Web Font Weight Variants
5 font weights loaded across 1 famil(y/ies)
REVIEW
5 font weights loaded across 1 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: Open Sans.
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Amazon Web Services, CDN: Cloudflare
Info::
Amazon Web Services: 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 Amazon Web Services✓CDN Cloudflare✓

Amazon Web Services: 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 256 KB (vs 11007 KB first visit). 578 of 586 resources are served from browser cache, saving 2.48g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 2.54g)
First visit
11007 KB
Repeat visit
256 KB

98% reduction on repeat visits

Saving 2.48g CO2 per returning visitor

578 resources served from cache · 8 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
89 images, 1685 KB total, 12 KB wasted
INFO

Image Optimization Audit

Total Images

89

Total Size

1685 KB

Oversized

1

Wasted

12 KB

1 missing alt text 11 missing dimensions 20 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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