B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Dated
8.4%
8.4% -- conversion rate lift from 0 1s speed improvement for mobile websites (2020)
A 0.1-second improvement in mobile site speed can increase conversion rates by 8.4% to 10.1%.
- Reported as a range of 8.4% to 10.1%
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
8.4%
Unit
Percentage
Data Vintage
2020
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Deloitte
Primary
Tier C
https://nexalab.io/blog/how-to-make-a-good-website/ ↗
Source Article
How To Make A Good Website: 10 Best Practices
The conversation around how to make a good website has shifted. Today, a nice-looking site isn’t enough. Your website has to work.
The website must load fast, guide users intuitively, and convert without friction. According to a 2020 Deloitte report, a 0.1-second improvement in mobile site speed can…
Original Research
Deloitte
· Original study ↗
Methodology
Range reported (8.4%-10.1%); midpoint used. Deloitte study on mobile site speed and conversion rates, cited secondhand by Nexalab blog.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
mobile websites: 8.4% conversion rate lift from 0 1s speed improvement. Source: Deloitte (2020). Via Lighthouse Intelligence -- https://lighthousedata.io/data/mobile-site-speed-conversion-lift-deloitte
HTML Embed
<blockquote cite="https://lighthousedata.io/data/mobile-site-speed-conversion-lift-deloitte" 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 from 0 1s speed improvement for mobile websites<br><small>Source: Deloitte (2020) · <a href="https://lighthousedata.io/data/mobile-site-speed-conversion-lift-deloitte" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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