https://www.rsea.com.au
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
61
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
DCO2 Per Page LoadAction1.48g CO2 per viewFIX
CO2 Per Page Load
Action1.48g CO2 per view
1.48g CO2 per view
Warning::
1.48g CO2 per page view
This page transfers 5.2 MB, producing an estimated 1.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.26g, end-user device 0.95g.
Got: 1.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 177.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 177.5 kg of CO2 annually — equivalent to charging 22182 smartphones.
1.48g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 25% of websites
Sustainable Web Design model v4 · Page size: 5.2 MB
Your site
1.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.27g
Network
0.26g
End-user device
0.95g
At 10,000 monthly views: Monthly: 14.8 kg · Annual: 177.5 kg · ≈ 22182 smartphone charges
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Snowplow Analytics✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction75th percentileFIX
Carbon Budget
Action75th percentile
75th percentile
Warning::
1.48g CO2 — above the median website (0.60g)
Heavier than an estimated 25% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 75th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.48g
75th percentile
Cleaner than 25% of websites
✗ Above the median website
vs Median 146% more
vs Target 196% more
BTransfer Efficiency77% efficientREVIEW
Transfer Efficiency
77% efficient
77% efficient
Info::
Transfer efficiency: 77%
An estimated 1238 KB (23%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1238 KB of unused JavaScript. This wasted data produces 0.34g of unnecessary CO2 per page view.
Total waste: 1238 KB (23% of page weight)
Unused JS 1238 KB
0.34g unnecessary CO2 per visit
Actual transfer 5347 KB
Theoretical minimum 4108 KB
Potential savings 1238 KB (0.34g 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
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 159 KB (vs 5347 KB first visit). 186 of 192 resources are served from browser cache, saving 1.43g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.48g)
First visit
5347 KB
Repeat visit
159 KB
97% reduction on repeat visits
Saving 1.43g CO2 per returning visitor
186 resources served from cache · 6 resources re-downloaded
Image Optimization107 images, 3087 KB total, 1111 KB wastedINFO
Image Optimization
107 images, 3087 KB total, 1111 KB wasted
Image Optimization Audit
Total Images
107
Total Size
3087 KB
Oversized
14
Wasted
1111 KB
3 missing alt text 106 missing dimensions 104 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.