B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
6.4%
6.4% -- checkout completion improvement per 100ms for ecommerce checkout page speed (2025)
Every 100ms improvement in checkout page responsiveness correlates with a 6.4% improvement in checkout completion.
- Correlational finding based on Google performance data on Interaction to Next Paint (INP)
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
6.4%
Unit
Percentage
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Google
Primary
Tier B
https://kirro.io/checkout-optimization-best-practices ↗
Source Article
9 Checkout Optimization Best Practices (Data-Backed)
The average ecommerce checkout loses over half its shoppers before they finish paying. Baymard Institute found that better checkout design alone can lift conversions by 35%. And yet 65% of the top ecommerce sites still score “mediocre or worse” at checkout.
That means most stores are leaving money o…
Original Research
Google
· Original study ↗
Methodology
Google performance data
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
ecommerce checkout page speed: 6.4% checkout completion improvement per 100ms. Source: Google (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/inp-100ms-completion-6-4
HTML Embed
<blockquote cite="https://lighthousedata.io/data/inp-100ms-completion-6-4" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>6.4%</strong> -- checkout completion improvement per 100ms for ecommerce checkout page speed<br><small>Source: Google (2025) · <a href="https://lighthousedata.io/data/inp-100ms-completion-6-4" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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