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
FCO2 Per Page LoadAction1.54g CO2 per viewFIX
CO2 Per Page Load
Action1.54g CO2 per view
1.54g CO2 per view
Warning::
1.54g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.54g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.27g, end-user device 0.99g.
Got: 1.54g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 184.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 184.4 kg of CO2 annually — equivalent to charging 23049 smartphones.
1.54g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 24% of websites
Sustainable Web Design model v4 · Page size: 5.4 MB
Your site
1.54g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.28g
Network
0.27g
End-user device
0.99g
At 10,000 monthly views: Monthly: 15.4 kg · Annual: 184.4 kg · ≈ 23049 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 BudgetAction76th percentileFIX
Carbon Budget
Action76th percentile
76th percentile
Warning::
1.54g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.54g
76th percentile
Cleaner than 24% of websites
✗ Above the median website
vs Median 156% more
vs Target 207% more
BTransfer Efficiency78% efficientREVIEW
Transfer Efficiency
78% efficient
78% efficient
Info::
Transfer efficiency: 78%
An estimated 1212 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1212 KB of unused JavaScript. This wasted data produces 0.34g of unnecessary CO2 per page view.
Total waste: 1212 KB (22% of page weight)
Unused JS 1212 KB
0.34g unnecessary CO2 per visit
Actual transfer 5556 KB
Theoretical minimum 4343 KB
Potential savings 1212 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 150 KB (vs 5556 KB first visit). 169 of 175 resources are served from browser cache, saving 1.50g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.54g)
First visit
5556 KB
Repeat visit
150 KB
97% reduction on repeat visits
Saving 1.50g CO2 per returning visitor
169 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.