https://garbau-git-preview-garbau.vercel.app
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
85
GRADE
B
FIX
0
REVIEW
4
PASS
3
INFO
1
Checks
83 PASS 4 REVIEW
BCarbon Budget38th percentileREVIEW
Carbon Budget
38th percentile
38th percentile
Info::
0.49g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 62% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 38th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.49g
38th percentile
Cleaner than 62% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 19% cleaner ✓
vs Target 3% cleaner ✓
BTransfer Efficiency85% efficientREVIEW
Transfer Efficiency
85% efficient
85% efficient
Info::
Transfer efficiency: 85%
An estimated 322 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 322 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
Total waste: 322 KB (15% of page weight)
Unused JS 322 KB
0.07g unnecessary CO2 per visit
Actual transfer 2107 KB
Theoretical minimum 1785 KB
Potential savings 322 KB (0.07g CO2)
See Deep Analysis sections above for specific optimizations.
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
ACO2 Per Page Load0.49g CO2 per viewPASS
CO2 Per Page Load
0.49g CO2 per view
0.49g CO2 per view
Info::
0.49g CO2 per page view
This page transfers 2.1 MB, producing an estimated 0.49g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.37g.
Got: 0.49g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 58.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 58.4 kg of CO2 annually — equivalent to charging 7306 smartphones.
Info::
Green hosting reduces data center emissions
0.49g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 62% of websites
Sustainable Web Design model v4 · Page size: 2.1 MB
Your site
0.49g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.10g
End-user device
0.37g
At 10,000 monthly views: Monthly: 4.9 kg · Annual: 58.4 kg · ≈ 7306 smartphone charges
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Vercel CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
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 Vercel✓
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
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 29 KB (vs 2107 KB first visit). 130 of 131 resources are served from browser cache, saving 0.48g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.49g)
First visit
2107 KB
Repeat visit
29 KB
99% reduction on repeat visits
Saving 0.48g CO2 per returning visitor
130 resources served from cache · 1 resources re-downloaded
Image Optimization6 images, 4 KB total, 0 KB wastedINFO
Image Optimization
6 images, 4 KB total, 0 KB wasted
Image Optimization Audit
Total Images
6
Total Size
4 KB
3 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.