https://ONIXLabs.io
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
75
GRADE
C
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
84 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction1.83g CO2 per viewFIX
CO2 Per Page Load
Action1.83g CO2 per view
1.83g CO2 per view
Warning::
1.83g CO2 per page view
This page transfers 7.7 MB, producing an estimated 1.83g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.38g, end-user device 1.40g.
Got: 1.83g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 219.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 219.5 kg of CO2 annually — equivalent to charging 27436 smartphones.
Info::
Green hosting reduces data center emissions
1.83g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 15% of websites
Sustainable Web Design model v4 · Page size: 7.7 MB
Your site
1.83g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.05g
Network
0.38g
End-user device
1.40g
At 10,000 monthly views: Monthly: 18.3 kg · Annual: 219.5 kg · ≈ 27436 smartphone charges
FCarbon BudgetAction85th percentileFIX
Carbon Budget
Action85th percentile
85th percentile
Warning::
1.83g CO2 — above the median website (0.60g)
Heavier than an estimated 15% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 85th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.83g
85th percentile
Cleaner than 15% of websites
✗ Above the median website
vs Median 205% more
vs Target 266% 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: GitHub Pages, CDN: Fastly
Info::
GitHub Pages: Verified by the Green Web Foundation
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: Verified by the Green Web Foundation
Fastly: 100% renewable energy for edge network
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 1 KB (vs 7913 KB first visit). 121 of 122 resources are served from browser cache, saving 1.83g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.83g)
First visit
7913 KB
Repeat visit
1 KB
100% reduction on repeat visits
Saving 1.83g CO2 per returning visitor
121 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 43 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 43 KB (1% of page weight)
Unused JS 43 KB
0.01g unnecessary CO2 per visit
Actual transfer 7913 KB
Theoretical minimum 7870 KB
Potential savings 43 KB (0.01g 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: Fastly
Image Optimization42 images, 3710 KB total, 0 KB wastedINFO
Image Optimization
42 images, 3710 KB total, 0 KB wasted
Image Optimization Audit
Total Images
42
Total Size
3710 KB
42 missing dimensions 38 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.