https://www.bleriotpardubice.cz
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
62
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
FCO2 Per Page LoadAction2.57g CO2 per viewFIX
CO2 Per Page Load
Action2.57g CO2 per view
2.57g CO2 per view
Critical::
2.57g CO2 per page view
This page transfers 9.1 MB, producing an estimated 2.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.48g, network 0.45g, end-user device 1.65g.
Got: 2.57g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 309.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 309.0 kg of CO2 annually — equivalent to charging 38621 smartphones.
2.57g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 9.1 MB
Your site
2.57g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.48g
Network
0.45g
End-user device
1.65g
At 10,000 monthly views: Monthly: 25.7 kg · Annual: 309.0 kg · ≈ 38621 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 Apache Traffic Server✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.57g 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
2.57g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 329% more
vs Target 415% 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
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 51 KB (vs 9309 KB first visit). 63 of 67 resources are served from browser cache, saving 2.56g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.57g)
First visit
9309 KB
Repeat visit
51 KB
99% reduction on repeat visits
Saving 2.56g CO2 per returning visitor
63 resources served from cache · 4 resources re-downloaded
A+Transfer Efficiency92% efficientPASS
Transfer Efficiency
92% efficient
92% efficient
Info::
Transfer efficiency: 92%
Only 773 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 773 KB (8% of page weight)
Unused JS 773 KB
0.21g unnecessary CO2 per visit
Actual transfer 9309 KB
Theoretical minimum 8536 KB
Potential savings 773 KB (0.21g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization33 images, 6529 KB total, 2100 KB wastedINFO
Image Optimization
33 images, 6529 KB total, 2100 KB wasted
Image Optimization Audit
Total Images
33
Total Size
6529 KB
Oversized
15
Wasted
2100 KB
2 missing alt text 33 missing dimensions 31 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.