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Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
69
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction2.02g CO2 per viewFIX
CO2 Per Page Load
Action2.02g CO2 per view
2.02g CO2 per view
Critical::
2.02g CO2 per page view
This page transfers 8.5 MB, producing an estimated 2.02g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.42g, end-user device 1.55g.
Got: 2.02g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 241.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 241.8 kg of CO2 annually — equivalent to charging 30227 smartphones.
Info::
Green hosting reduces data center emissions
2.02g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 8.5 MB
Your site
2.02g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.05g
Network
0.42g
End-user device
1.55g
At 10,000 monthly views: Monthly: 20.2 kg · Annual: 241.8 kg · ≈ 30227 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.02g 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
2.02g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 236% more
vs Target 303% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Next.js uses renewable energy
Info::
Next.js: Verified by the Green Web Foundation
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 Not identified✗
Next.js: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
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+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 11 KB (vs 8718 KB first visit). 25 of 26 resources are served from browser cache, saving 2.01g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 2.02g)
First visit
8718 KB
Repeat visit
11 KB
100% reduction on repeat visits
Saving 2.01g CO2 per returning visitor
25 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 50 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 50 KB (1% of page weight)
Unused JS 50 KB
0.01g unnecessary CO2 per visit
Actual transfer 8718 KB
Theoretical minimum 8668 KB
Potential savings 50 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: Google Cloud
Image Optimization3 images, 997 KB total, 976 KB wastedINFO
Image Optimization
3 images, 997 KB total, 976 KB wasted
Image Optimization Audit
Total Images
3
Total Size
997 KB
Oversized
2
Wasted
976 KB
2 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.