https://thehobby.academy
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
85
GRADE
B
FIX
0
REVIEW
2
PASS
5
INFO
1
Checks
85 PASS 2 REVIEW
BTransfer Efficiency80% efficientREVIEW
Transfer Efficiency
80% efficient
80% efficient
Info::
Transfer efficiency: 80%
An estimated 267 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 267 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.
Total waste: 267 KB (20% of page weight)
Unused JS 267 KB
0.06g unnecessary CO2 per visit
Actual transfer 1325 KB
Theoretical minimum 1058 KB
Potential savings 267 KB (0.06g 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.
ACO2 Per Page Load0.31g CO2 per viewPASS
CO2 Per Page Load
0.31g CO2 per view
0.31g CO2 per view
Info::
0.31g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.31g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.24g.
Got: 0.31g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 36.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 36.8 kg of CO2 annually — equivalent to charging 4595 smartphones.
Info::
Green hosting reduces data center emissions
0.31g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 80% of websites
Sustainable Web Design model v4 · Page size: 1.3 MB
Your site
0.31g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.06g
End-user device
0.24g
At 10,000 monthly views: Monthly: 3.1 kg · Annual: 36.8 kg · ≈ 4595 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
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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 26 KB (vs 1325 KB first visit). 31 of 32 resources are served from browser cache, saving 0.30g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.31g)
First visit
1325 KB
Repeat visit
26 KB
98% reduction on repeat visits
Saving 0.30g CO2 per returning visitor
31 resources served from cache · 1 resources re-downloaded
ACarbon Budget20th percentilePASS
Carbon Budget
20th percentile
20th percentile
Info::
0.31g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 80% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 20th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.31g
20th percentile
Cleaner than 80% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 49% cleaner ✓
vs Target 39% cleaner ✓
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 Optimization13 images, 1597 KB total, 0 KB wastedINFO
Image Optimization
13 images, 1597 KB total, 0 KB wasted
Image Optimization Audit
Total Images
13
Total Size
1597 KB
3 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.