https://racing-hub.pages.dev
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
90
GRADE
A
FIX
0
REVIEW
1
PASS
6
INFO
1
Checks
86 PASS 1 REVIEW
CWeb Font Weight VariantsAction10 font weights loaded across 2 famil(y/ies)REVIEW
Web Font Weight Variants
Action10 font weights loaded across 2 famil(y/ies)
10 font weights loaded across 2 famil(y/ies)
Warning::
10 font weights loaded -- likely 100+ KB of unused payload
Loading 10 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Inter, Outfit.
ACO2 Per Page Load0.38g CO2 per viewPASS
CO2 Per Page Load
0.38g CO2 per view
0.38g CO2 per view
Info::
0.38g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.38g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.29g.
Got: 0.38g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 45.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 45.7 kg of CO2 annually — equivalent to charging 5711 smartphones.
Info::
Green hosting reduces data center emissions
0.38g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 72% of websites
Sustainable Web Design model v4 · Page size: 1.6 MB
Your site
0.38g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 3.8 kg · Annual: 45.7 kg · ≈ 5711 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare Pages
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare Pages: Runs on Cloudflare's 100% renewable network
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 Pages✓
Cloudflare: Verified by the Green Web Foundation
Cloudflare Pages: Runs on Cloudflare's 100% renewable network
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 3 KB (vs 1647 KB first visit). 51 of 52 resources are served from browser cache, saving 0.38g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.38g)
First visit
1647 KB
Repeat visit
3 KB
100% reduction on repeat visits
Saving 0.38g CO2 per returning visitor
51 resources served from cache · 1 resources re-downloaded
ACarbon Budget28th percentilePASS
Carbon Budget
28th percentile
28th percentile
Info::
0.38g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 72% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 28th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.38g
28th percentile
Cleaner than 72% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 37% cleaner ✓
vs Target 24% cleaner ✓
A+Transfer Efficiency97% efficientPASS
Transfer Efficiency
97% efficient
97% efficient
Info::
Transfer efficiency: 97%
Only 43 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 43 KB (3% of page weight)
Unused JS 43 KB
0.01g unnecessary CO2 per visit
Actual transfer 1647 KB
Theoretical minimum 1604 KB
Potential savings 43 KB (0.01g 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 Optimization37 images, 1137 KB total, 1135 KB wastedINFO
Image Optimization
37 images, 1137 KB total, 1135 KB wasted
Image Optimization Audit
Total Images
37
Total Size
1137 KB
Oversized
1
Wasted
1135 KB
34 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.