https://fjackets.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
75
GRADE
C
FIX
1
REVIEW
4
PASS
2
INFO
1
Checks
82 PASS 4 REVIEW 1 FIX
DCarbon BudgetAction54th percentileFIX
Carbon Budget
Action54th percentile
54th percentile
Warning::
0.75g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.75g
54th percentile
Cleaner than 46% of websites
✗ Above the median website
vs Median 25% more
vs Target 50% more
BCO2 Per Page Load0.75g CO2 per viewREVIEW
CO2 Per Page Load
0.75g CO2 per view
0.75g CO2 per view
Info::
0.75g CO2 per page view
This page transfers 3.2 MB, producing an estimated 0.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.16g, end-user device 0.58g.
Got: 0.75g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 90.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 90.3 kg of CO2 annually — equivalent to charging 11286 smartphones.
Info::
Green hosting reduces data center emissions
0.75g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 46% of websites
Sustainable Web Design model v4 · Page size: 3.2 MB
Your site
0.75g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.16g
End-user device
0.58g
At 10,000 monthly views: Monthly: 7.5 kg · Annual: 90.3 kg · ≈ 11286 smartphone charges
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Amazon Web Services uses renewable energy
Info::
Amazon Web Services: Verified by the Green Web Foundation
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 Amazon Web Services✓CDN Not identified✗
Amazon Web Services: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BTransfer Efficiency88% efficientREVIEW
Transfer Efficiency
88% efficient
88% efficient
Info::
Transfer efficiency: 88%
An estimated 406 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 406 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
Total waste: 406 KB (12% of page weight)
Unused JS 406 KB
0.09g unnecessary CO2 per visit
Actual transfer 3255 KB
Theoretical minimum 2848 KB
Potential savings 406 KB (0.09g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction12 font weights loaded across 3 famil(y/ies)REVIEW
Web Font Weight Variants
Action12 font weights loaded across 3 famil(y/ies)
12 font weights loaded across 3 famil(y/ies)
Warning::
12 font weights loaded -- likely 100+ KB of unused payload
Loading 12 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: Bricolage Grotesque, Oswald, Work Sans.
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 75 KB (vs 3255 KB first visit). 152 of 157 resources are served from browser cache, saving 0.73g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.75g)
First visit
3255 KB
Repeat visit
75 KB
98% reduction on repeat visits
Saving 0.73g CO2 per returning visitor
152 resources served from cache · 5 resources re-downloaded
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: Google Cloud
Image Optimization53 images, 671 KB total, 171 KB wastedINFO
Image Optimization
53 images, 671 KB total, 171 KB wasted
Image Optimization Audit
Total Images
53
Total Size
671 KB
Oversized
6
Wasted
171 KB
24 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.