https://Bili.works
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
4
PASS
3
INFO
1
Checks
83 PASS 4 REVIEW
BCO2 Per Page Load0.53g CO2 per viewREVIEW
CO2 Per Page Load
0.53g CO2 per view
0.53g CO2 per view
Info::
0.53g CO2 per page view
This page transfers 2.3 MB, producing an estimated 0.53g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.41g.
Got: 0.53g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 64.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 64.0 kg of CO2 annually — equivalent to charging 7995 smartphones.
Info::
Green hosting reduces data center emissions
0.53g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 57% of websites
Sustainable Web Design model v4 · Page size: 2.3 MB
Your site
0.53g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.11g
End-user device
0.41g
At 10,000 monthly views: Monthly: 5.3 kg · Annual: 64.0 kg · ≈ 7995 smartphone charges
BCarbon Budget43th percentileREVIEW
Carbon Budget
43th percentile
43th percentile
Info::
0.53g CO2 — below the median website (0.60g)
Better than an estimated 57% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 43th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.53g
43rd percentile
Cleaner than 57% of websites
✗ Above the median website
vs Median 11% cleaner ✓
vs Target 7% 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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: GitHub Pages, CDN: Fastly
Info::
GitHub Pages: Hosted on Azure/GitHub with Microsoft carbon-negative commitment
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 GitHub Pages✓CDN Fastly✓
GitHub Pages: Hosted on Azure/GitHub with Microsoft carbon-negative commitment
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 12 KB (vs 2306 KB first visit). 28 of 30 resources are served from browser cache, saving 0.53g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.53g)
First visit
2306 KB
Repeat visit
12 KB
99% reduction on repeat visits
Saving 0.53g CO2 per returning visitor
28 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency91% efficientPASS
Transfer Efficiency
91% efficient
91% efficient
Info::
Transfer efficiency: 91%
Only 196 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 196 KB (9% of page weight)
Unused JS 196 KB
0.05g unnecessary CO2 per visit
Actual transfer 2306 KB
Theoretical minimum 2109 KB
Potential savings 196 KB (0.05g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization4 images, 627 KB total, 210 KB wastedINFO
Image Optimization
4 images, 627 KB total, 210 KB wasted
Image Optimization Audit
Total Images
4
Total Size
627 KB
Oversized
3
Wasted
210 KB
4 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.