https://elastic.co
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
66
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction3.74g CO2 per viewFIX
CO2 Per Page Load
Action3.74g CO2 per view
3.74g CO2 per view
Critical::
3.74g CO2 per page view
This page transfers 15.8 MB, producing an estimated 3.74g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.77g, end-user device 2.87g.
Got: 3.74g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 448.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 448.6 kg of CO2 annually — equivalent to charging 56070 smartphones.
Info::
Green hosting reduces data center emissions
3.74g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 15.8 MB
Your site
3.74g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.09g
Network
0.77g
End-user device
2.87g
At 10,000 monthly views: Monthly: 37.4 kg · Annual: 448.6 kg · ≈ 56070 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
3.74g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
3.74g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 523% more
vs Target 648% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: Verified by the Green Web Foundation
Info::
Google Cloud CDN: Inherits Google Cloud regional renewable mix
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 Google Cloud✓CDN Google Cloud CDN✗
Google Cloud: Verified by the Green Web Foundation
Google Cloud CDN: Inherits Google Cloud regional renewable mix
Based on known provider commitments. Verify at thegreenwebfoundation.org
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.
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 99 KB (vs 16172 KB first visit). 231 of 237 resources are served from browser cache, saving 3.72g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 3.74g)
First visit
16172 KB
Repeat visit
99 KB
99% reduction on repeat visits
Saving 3.72g CO2 per returning visitor
231 resources served from cache · 6 resources re-downloaded
A+Transfer Efficiency94% efficientPASS
Transfer Efficiency
94% efficient
94% efficient
Info::
Transfer efficiency: 94%
Only 918 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 918 KB (6% of page weight)
Unused JS 918 KB
0.21g unnecessary CO2 per visit
Actual transfer 16172 KB
Theoretical minimum 15253 KB
Potential savings 918 KB (0.21g CO2)
See Deep Analysis sections above for specific optimizations.
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 Optimization26 images, 0 KB total, 0 KB wastedINFO
Image Optimization
26 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
26
Total Size
0 KB
Oversized
14
6 missing alt text 26 missing dimensions 26 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.