B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Dated
8.4%
8.4% -- conversion rate lift for Retail ecommerce sites (2020)
A 0.1-second improvement in load time increases retail conversions by 8.4%.
Attribution:
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Lighthouse Research Team
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Source verified
Evidence graded
Value
8.4%
Unit
Percentage
Data Vintage
2020
Entity
Sample Size
37
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Sources (2)
Deloitte and Google
Primary
Tier B
https://digitalstrategyforce.com/journal/why-is-technical-seo-the-most-undervalued-competitive-advan… ↗
Source Article
Why Is Technical SEO the Most Undervalued Competitive Advantage? | Digital Strategy Force
Why Is Technical SEO the Most Undervalued Competitive Advantage?
Technical SEO is the most undervalued competitive advantage in digital strategy because its effects are invisible to everyone except the search engines that decide visibility. Crawl architecture, render performance, and index coverage …
Also cited by
2026-09-29
Original Research
Deloitte and Google
· Original study ↗
Methodology
Deloitte/Google 'Milliseconds Make Millions' study of 37 brand sites and 30 million user sessions; 0.1-second load time improvement
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Retail ecommerce sites: 8.4% conversion rate lift. Source: Deloitte and Google (2020). Via Lighthouse Intelligence -- https://lighthousedata.io/data/load-time-improvement-retail-conversion-boost
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<blockquote cite="https://lighthousedata.io/data/load-time-improvement-retail-conversion-boost" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>8.4%</strong> -- conversion rate lift for Retail ecommerce sites<br><small>Source: Deloitte and Google (2020) · <a href="https://lighthousedata.io/data/load-time-improvement-retail-conversion-boost" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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