https://wan3video.art
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
98
GRADE
A+
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
84 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction3.12g CO2 per viewFIX
CO2 Per Page Load
Action3.12g CO2 per view
3.12g CO2 per view
Critical::
3.12g CO2 per page view
This page transfers 13.2 MB, producing an estimated 3.12g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.65g, end-user device 2.40g.
Got: 3.12g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 374.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 374.4 kg of CO2 annually — equivalent to charging 46804 smartphones.
Info::
Green hosting reduces data center emissions
3.12g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 13.2 MB
Your site
3.12g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.08g
Network
0.65g
End-user device
2.40g
At 10,000 monthly views: Monthly: 31.2 kg · Annual: 374.4 kg · ≈ 46804 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
3.12g 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
3.12g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 420% more
vs Target 524% 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: Cloudflare
Info::
Next.js: 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 Next.js✓CDN Cloudflare✓
Next.js: 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 Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 41 KB (vs 13499 KB first visit). 102 of 103 resources are served from browser cache, saving 3.11g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.12g)
First visit
13499 KB
Repeat visit
41 KB
100% reduction on repeat visits
Saving 3.11g CO2 per returning visitor
102 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 70 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 70 KB (1% of page weight)
Unused JS 70 KB
0.02g unnecessary CO2 per visit
Actual transfer 13499 KB
Theoretical minimum 13429 KB
Potential savings 70 KB (0.02g 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: Cloudflare
Image Optimization28 images, 28 KB total, 0 KB wastedINFO
Image Optimization
28 images, 28 KB total, 0 KB wasted
Image Optimization Audit
Total Images
28
Total Size
28 KB
Oversized
2
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.