https://psichologie.cz
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
65
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
FCO2 Per Page LoadAction1.91g CO2 per viewFIX
CO2 Per Page Load
Action1.91g CO2 per view
1.91g CO2 per view
Warning::
1.91g CO2 per page view
This page transfers 6.7 MB, producing an estimated 1.91g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.35g, network 0.33g, end-user device 1.22g.
Got: 1.91g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 228.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 228.7 kg of CO2 annually — equivalent to charging 28582 smartphones.
1.91g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 13% of websites
Sustainable Web Design model v4 · Page size: 6.7 MB
Your site
1.91g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.35g
Network
0.33g
End-user device
1.22g
At 10,000 monthly views: Monthly: 19.1 kg · Annual: 228.7 kg · ≈ 28582 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 BudgetAction87th percentileFIX
Carbon Budget
Action87th percentile
87th percentile
Warning::
1.91g CO2 — above the median website (0.60g)
Heavier than an estimated 13% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 87th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.91g
87th percentile
Cleaner than 13% of websites
✗ Above the median website
vs Median 218% more
vs Target 281% 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 62 KB (vs 6889 KB first visit). 183 of 184 resources are served from browser cache, saving 1.89g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.91g)
First visit
6889 KB
Repeat visit
62 KB
99% reduction on repeat visits
Saving 1.89g CO2 per returning visitor
183 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency98% efficientPASS
Transfer Efficiency
98% efficient
98% efficient
Info::
Transfer efficiency: 98%
Only 114 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 114 KB (2% of page weight)
Unused JS 114 KB
0.03g unnecessary CO2 per visit
Actual transfer 6889 KB
Theoretical minimum 6775 KB
Potential savings 114 KB (0.03g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization116 images, 1657 KB total, 18 KB wastedINFO
Image Optimization
116 images, 1657 KB total, 18 KB wasted
Image Optimization Audit
Total Images
116
Total Size
1657 KB
Oversized
2
Wasted
18 KB
116 missing dimensions 115 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.