https://www.maddox.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
72
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction3.84g CO2 per viewFIX
CO2 Per Page Load
Action3.84g CO2 per view
3.84g CO2 per view
Critical::
3.84g CO2 per page view
This page transfers 16.2 MB, producing an estimated 3.84g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.79g, end-user device 2.95g.
Got: 3.84g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 460.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 460.9 kg of CO2 annually — equivalent to charging 57613 smartphones.
Info::
Green hosting reduces data center emissions
3.84g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 16.2 MB
Your site
3.84g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.10g
Network
0.79g
End-user device
2.95g
At 10,000 monthly views: Monthly: 38.4 kg · Annual: 460.9 kg · ≈ 57613 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
3.84g 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
3.84g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 540% more
vs Target 668% 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
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Amazon Web Services✗CDN Cloudflare✓
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 75 KB (vs 16617 KB first visit). 168 of 172 resources are served from browser cache, saving 3.82g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 3.84g)
First visit
16617 KB
Repeat visit
75 KB
100% reduction on repeat visits
Saving 3.82g CO2 per returning visitor
168 resources served from cache · 4 resources re-downloaded
A+Transfer Efficiency91% efficientPASS
Transfer Efficiency
91% efficient
91% efficient
Info::
Transfer efficiency: 91%
Only 1465 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 1465 KB (9% of page weight)
Unused JS 1465 KB
0.34g unnecessary CO2 per visit
Actual transfer 16617 KB
Theoretical minimum 15151 KB
Potential savings 1465 KB (0.34g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization155 images, 0 KB total, 0 KB wastedINFO
Image Optimization
155 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
155
Total Size
0 KB
154 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.