https://vox.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
70
GRADE
C
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
84 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction15.46g CO2 per viewFIX
CO2 Per Page Load
Action15.46g CO2 per view
15.46g CO2 per view
Critical::
15.46g CO2 per page view
This page transfers 65.3 MB, producing an estimated 15.46g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.39g, network 3.20g, end-user device 11.87g.
Got: 15.46g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1854.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1854.9 kg of CO2 annually — equivalent to charging 231859 smartphones.
Info::
Green hosting reduces data center emissions
15.46g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 65.3 MB
Your site
15.46g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.39g
Network
3.20g
End-user device
11.87g
At 10,000 monthly views: Monthly: 154.6 kg · Annual: 1854.9 kg · ≈ 231859 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
15.46g 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
15.46g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 2476% more
vs Target 2991% more
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
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 HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Fastly
Info::
Next.js: Verified by the Green Web Foundation
Info::
Fastly: 100% renewable energy for edge network
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.js✓CDN Fastly✓
Next.js: Verified by the Green Web Foundation
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 70 KB (vs 66873 KB first visit). 173 of 178 resources are served from browser cache, saving 15.44g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 15.46g)
First visit
66873 KB
Repeat visit
70 KB
100% reduction on repeat visits
Saving 15.44g CO2 per returning visitor
173 resources served from cache · 5 resources re-downloaded
A+Transfer Efficiency98% efficientPASS
Transfer Efficiency
98% efficient
98% efficient
Info::
Transfer efficiency: 98%
Only 1607 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 1607 KB (2% of page weight)
Unused JS 1607 KB
0.37g unnecessary CO2 per visit
Actual transfer 66873 KB
Theoretical minimum 65266 KB
Potential savings 1607 KB (0.37g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Axis12 Ltd
Image Optimization137 images, 0 KB total, 0 KB wastedINFO
Image Optimization
137 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
137
Total Size
0 KB
137 missing dimensions 4 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.