https://unmineable.wordpress.com/2026/11/11/pearl-prl-mining-guide/
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
68
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
DCO2 Per Page LoadAction1.23g CO2 per viewFIX
CO2 Per Page Load
Action1.23g CO2 per view
1.23g CO2 per view
Warning::
1.23g CO2 per page view
This page transfers 4.3 MB, producing an estimated 1.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.23g, network 0.21g, end-user device 0.79g.
Got: 1.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 147.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 147.2 kg of CO2 annually — equivalent to charging 18397 smartphones.
1.23g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 33% of websites
Sustainable Web Design model v4 · Page size: 4.3 MB
Your site
1.23g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.23g
Network
0.21g
End-user device
0.79g
At 10,000 monthly views: Monthly: 12.3 kg · Annual: 147.2 kg · ≈ 18397 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 WordPress.com✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction67th percentileFIX
Carbon Budget
Action67th percentile
67th percentile
Warning::
1.23g CO2 — above the median website (0.60g)
Heavier than an estimated 33% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 67th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.23g
67th percentile
Cleaner than 33% of websites
✗ Above the median website
vs Median 104% more
vs Target 145% more
BTransfer Efficiency89% efficientREVIEW
Transfer Efficiency
89% efficient
89% efficient
Info::
Transfer efficiency: 89%
An estimated 473 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 473 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
Total waste: 473 KB (11% of page weight)
Unused JS 473 KB
0.13g unnecessary CO2 per visit
Actual transfer 4434 KB
Theoretical minimum 3961 KB
Potential savings 473 KB (0.13g 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.
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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 70 KB (vs 4434 KB first visit). 116 of 121 resources are served from browser cache, saving 1.21g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.23g)
First visit
4434 KB
Repeat visit
70 KB
98% reduction on repeat visits
Saving 1.21g CO2 per returning visitor
116 resources served from cache · 5 resources re-downloaded
Image Optimization10 images, 1861 KB total, 40 KB wastedINFO
Image Optimization
10 images, 1861 KB total, 40 KB wasted
Image Optimization Audit
Total Images
10
Total Size
1861 KB
Oversized
1
Wasted
40 KB
2 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.