https://popularkeys.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
79
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
DCO2 Per Page LoadAction1.20g CO2 per viewFIX
CO2 Per Page Load
Action1.20g CO2 per view
1.20g CO2 per view
Warning::
1.20g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.20g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.25g, end-user device 0.93g.
Got: 1.20g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 144.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 144.6 kg of CO2 annually — equivalent to charging 18074 smartphones.
Info::
Green hosting reduces data center emissions
1.20g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 33% of websites
Sustainable Web Design model v4 · Page size: 5.1 MB
Your site
1.20g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.25g
End-user device
0.93g
At 10,000 monthly views: Monthly: 12.0 kg · Annual: 144.6 kg · ≈ 18074 smartphone charges
DCarbon BudgetAction67th percentileFIX
Carbon Budget
Action67th percentile
67th percentile
Warning::
1.20g 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
1.20g
67th percentile
Cleaner than 33% of websites
✗ Above the median website
vs Median 101% more
vs Target 141% 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
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Next.js✗CDN Cloudflare✓
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 78 KB (vs 5213 KB first visit). 116 of 117 resources are served from browser cache, saving 1.19g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.20g)
First visit
5213 KB
Repeat visit
78 KB
98% reduction on repeat visits
Saving 1.19g CO2 per returning visitor
116 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 68 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 68 KB (1% of page weight)
Unused JS 68 KB
0.02g unnecessary CO2 per visit
Actual transfer 5213 KB
Theoretical minimum 5145 KB
Potential savings 68 KB (0.02g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization87 images, 139 KB total, 3 KB wastedINFO
Image Optimization
87 images, 139 KB total, 3 KB wasted
Image Optimization Audit
Total Images
87
Total Size
139 KB
Oversized
1
Wasted
3 KB
57 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.