https://elwd.com.au
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
70
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction2.07g CO2 per viewFIX
CO2 Per Page Load
Action2.07g CO2 per view
2.07g CO2 per view
Critical::
2.07g CO2 per page view
This page transfers 8.7 MB, producing an estimated 2.07g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.43g, end-user device 1.59g.
Got: 2.07g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 248.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 248.3 kg of CO2 annually — equivalent to charging 31039 smartphones.
Info::
Green hosting reduces data center emissions
2.07g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 8.7 MB
Your site
2.07g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.05g
Network
0.43g
End-user device
1.59g
At 10,000 monthly views: Monthly: 20.7 kg · Annual: 248.3 kg · ≈ 31039 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.07g 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
2.07g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 245% more
vs Target 314% 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 Not identified✗CDN Cloudflare✓
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 205 KB (vs 8952 KB first visit). 537 of 546 resources are served from browser cache, saving 2.02g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 2.07g)
First visit
8952 KB
Repeat visit
205 KB
98% reduction on repeat visits
Saving 2.02g CO2 per returning visitor
537 resources served from cache · 9 resources re-downloaded
A+Transfer Efficiency92% efficientPASS
Transfer Efficiency
92% efficient
92% efficient
Info::
Transfer efficiency: 92%
Only 687 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 687 KB (8% of page weight)
Unused JS 687 KB
0.16g unnecessary CO2 per visit
Actual transfer 8952 KB
Theoretical minimum 8264 KB
Potential savings 687 KB (0.16g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization200 images, 3342 KB total, 2683 KB wastedINFO
Image Optimization
200 images, 3342 KB total, 2683 KB wasted
Image Optimization Audit
Total Images
200
Total Size
3342 KB
Oversized
10
Wasted
2683 KB
10 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.