https://rtx.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
88
GRADE
B
FIX
1
REVIEW
2
PASS
4
INFO
1
Checks
84 PASS 2 REVIEW 1 FIX
DCarbon BudgetAction54th percentileFIX
Carbon Budget
Action54th percentile
54th percentile
Warning::
0.77g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.77g
54th percentile
Cleaner than 46% of websites
✗ Above the median website
vs Median 29% more
vs Target 55% more
BCO2 Per Page Load0.77g CO2 per viewREVIEW
CO2 Per Page Load
0.77g CO2 per view
0.77g CO2 per view
Info::
0.77g CO2 per page view
This page transfers 3.3 MB, producing an estimated 0.77g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.16g, end-user device 0.59g.
Got: 0.77g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 92.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 92.7 kg of CO2 annually — equivalent to charging 11588 smartphones.
Info::
Green hosting reduces data center emissions
0.77g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 46% of websites
Sustainable Web Design model v4 · Page size: 3.3 MB
Your site
0.77g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.16g
End-user device
0.59g
At 10,000 monthly views: Monthly: 7.7 kg · Annual: 92.7 kg · ≈ 11588 smartphone charges
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+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
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 Cloudflare✓CDN Cloudflare✓
Cloudflare: Verified by the Green Web Foundation
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 16 KB (vs 3342 KB first visit). 60 of 61 resources are served from browser cache, saving 0.77g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.77g)
First visit
3342 KB
Repeat visit
16 KB
100% reduction on repeat visits
Saving 0.77g CO2 per returning visitor
60 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency92% efficientPASS
Transfer Efficiency
92% efficient
92% efficient
Info::
Transfer efficiency: 92%
Only 256 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 256 KB (8% of page weight)
Unused JS 256 KB
0.06g unnecessary CO2 per visit
Actual transfer 3342 KB
Theoretical minimum 3085 KB
Potential savings 256 KB (0.06g 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: Cloudflare
Image Optimization18 images, 0 KB total, 0 KB wastedINFO
Image Optimization
18 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
18
Total Size
0 KB
Oversized
2
2 missing alt text 1 missing dimensions 4 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.