https://yoast.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
88
GRADE
B
FIX
0
REVIEW
1
PASS
6
INFO
1
Checks
86 PASS 1 REVIEW
CTransfer EfficiencyAction75% efficientREVIEW
Transfer Efficiency
Action75% efficient
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 394 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 394 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
Total waste: 394 KB (25% of page weight)
Unused JS 394 KB
0.09g unnecessary CO2 per visit
Actual transfer 1556 KB
Theoretical minimum 1162 KB
Potential savings 394 KB (0.09g CO2)
See Deep Analysis sections above for specific optimizations.
ACO2 Per Page Load0.36g CO2 per viewPASS
CO2 Per Page Load
0.36g CO2 per view
0.36g CO2 per view
Info::
0.36g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.36g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.28g.
Got: 0.36g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 43.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 43.2 kg of CO2 annually — equivalent to charging 5398 smartphones.
Info::
Green hosting reduces data center emissions
0.36g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 75% of websites
Sustainable Web Design model v4 · Page size: 1.5 MB
Your site
0.36g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.07g
End-user device
0.28g
At 10,000 monthly views: Monthly: 3.6 kg · Annual: 43.2 kg · ≈ 5398 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
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 Cloudflare✓CDN 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 Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 55 KB (vs 1556 KB first visit). 105 of 108 resources are served from browser cache, saving 0.35g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.36g)
First visit
1556 KB
Repeat visit
55 KB
96% reduction on repeat visits
Saving 0.35g CO2 per returning visitor
105 resources served from cache · 3 resources re-downloaded
ACarbon Budget25th percentilePASS
Carbon Budget
25th percentile
25th percentile
Info::
0.36g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 75% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 25th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.36g
25th percentile
Cleaner than 75% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 40% cleaner ✓
vs Target 28% cleaner ✓
A+Web Font Weight Variants1 font weights loaded across 1 famil(y/ies) -- reasonablePASS
Web Font Weight Variants
1 font weights loaded across 1 famil(y/ies) -- reasonable
1 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
1 font weight(s) loaded across 1 famil(y/ies)
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: Cloudflare
Image Optimization53 images, 9 KB total, 2 KB wastedINFO
Image Optimization
53 images, 9 KB total, 2 KB wasted
Image Optimization Audit
Total Images
53
Total Size
9 KB
Oversized
2
Wasted
2 KB
46 missing alt text 7 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.