https://nanajacqueline.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
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction2.10g CO2 per viewFIX
CO2 Per Page Load
Action2.10g CO2 per view
2.10g CO2 per view
Critical::
2.10g CO2 per page view
This page transfers 8.9 MB, producing an estimated 2.10g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.43g, end-user device 1.61g.
Got: 2.10g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 251.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 251.8 kg of CO2 annually — equivalent to charging 31473 smartphones.
Info::
Green hosting reduces data center emissions
2.10g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 8.9 MB
Your site
2.10g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.05g
Network
0.43g
End-user device
1.61g
At 10,000 monthly views: Monthly: 21.0 kg · Annual: 251.8 kg · ≈ 31473 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.10g 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
2.10g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 250% more
vs Target 320% more
BTransfer Efficiency83% efficientREVIEW
Transfer Efficiency
83% efficient
83% efficient
Info::
Transfer efficiency: 83%
An estimated 1508 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1508 KB of unused JavaScript. This wasted data produces 0.35g of unnecessary CO2 per page view.
Total waste: 1508 KB (17% of page weight)
Unused JS 1508 KB
0.35g unnecessary CO2 per visit
Actual transfer 9077 KB
Theoretical minimum 7568 KB
Potential savings 1508 KB (0.35g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight Variants5 font weights loaded across 1 famil(y/ies)REVIEW
Web Font Weight Variants
5 font weights loaded across 1 famil(y/ies)
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: Roboto|Open Sans.
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 332 KB (vs 9077 KB first visit). 570 of 578 resources are served from browser cache, saving 2.02g CO2 per repeat visit.
Info::
Repeat visit: 0.08g CO2 (first visit: 2.10g)
First visit
9077 KB
Repeat visit
332 KB
96% reduction on repeat visits
Saving 2.02g CO2 per returning visitor
570 resources served from cache · 8 resources re-downloaded
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 Optimization200 images, 3192 KB total, 1401 KB wastedINFO
Image Optimization
200 images, 3192 KB total, 1401 KB wasted
Image Optimization Audit
Total Images
200
Total Size
3192 KB
Oversized
20
Wasted
1401 KB
83 missing dimensions 7 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.