https://ayvion.io
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
80
GRADE
B
FIX
1
REVIEW
1
PASS
5
INFO
1
Checks
85 PASS 1 REVIEW 1 FIX
DTransfer EfficiencyAction49% efficientFIX
Transfer Efficiency
Action49% efficient
49% efficient
Critical::
Transfer efficiency: 49%
An estimated 665 KB (51%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 665 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
Total waste: 665 KB (51% of page weight)
Unused JS 665 KB
0.15g unnecessary CO2 per visit
Actual transfer 1309 KB
Theoretical minimum 644 KB
Potential savings 665 KB (0.15g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction9 font weights loaded across 3 famil(y/ies)REVIEW
Web Font Weight Variants
Action9 font weights loaded across 3 famil(y/ies)
9 font weights loaded across 3 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: IBM Plex Mono, Inter, Inter Tight.
ACO2 Per Page Load0.30g CO2 per viewPASS
CO2 Per Page Load
0.30g CO2 per view
0.30g CO2 per view
Info::
0.30g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.23g.
Got: 0.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 36.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 36.3 kg of CO2 annually — equivalent to charging 4540 smartphones.
Info::
Green hosting reduces data center emissions
0.30g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 80% of websites
Sustainable Web Design model v4 · Page size: 1.3 MB
Your site
0.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.06g
End-user device
0.23g
At 10,000 monthly views: Monthly: 3.0 kg · Annual: 36.3 kg · ≈ 4540 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 Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 42 KB (vs 1309 KB first visit). 50 of 52 resources are served from browser cache, saving 0.29g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.30g)
First visit
1309 KB
Repeat visit
42 KB
97% reduction on repeat visits
Saving 0.29g CO2 per returning visitor
50 resources served from cache · 2 resources re-downloaded
ACarbon Budget20th percentilePASS
Carbon Budget
20th percentile
20th percentile
Info::
0.30g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 80% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 20th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.30g
20th percentile
Cleaner than 80% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 50% cleaner ✓
vs Target 39% cleaner ✓
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 Optimization2 images, 244 KB total, 119 KB wastedINFO
Image Optimization
2 images, 244 KB total, 119 KB wasted
Image Optimization Audit
Total Images
2
Total Size
244 KB
Oversized
1
Wasted
119 KB
1 missing dimensions 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.