B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Dated
8%
8% -- conversion rate lift per 0 1s speed improvement for mobile ecommerce sites (2021)
A 0.1-second improvement in mobile site speed can boost conversion rates by over 8% based on a 2021 Google and Deloitte study.
- Source states 'by over 8%'
Attribution:
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Lighthouse Research Team
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Evidence graded
Value
8%
Unit
Percentage
Data Vintage
2021
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
Google and Deloitte
Primary
Tier C
https://hotiron.digital/what-is-a-good-roas-for-ecommerce-in-ireland-2026-benchmarks/ ↗
Source Article
What Is a Good ROAS for Ecommerce in Ireland? (2026 Benchmarks) - HOT IRON Digital
That 4:1 ROAS benchmark you’ve been chasing? For many Irish e-commerce stores, it’s a direct path to losing money. It’s a frustrating reality when you’re trying to figure out what is a good roas for ecommerce ireland while pouring more budget into Google and Meta ads. With CPCs in Ireland climbing b…
Original Research
Google and Deloitte
· Original study ↗
Methodology
Google and Deloitte mobile site speed study, as cited by HOT IRON Digital
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
mobile ecommerce sites: 8% conversion rate lift per 0 1s speed improvement. Source: Google and Deloitte (2021). Via Lighthouse Intelligence -- https://lighthousedata.io/data/site-speed-conversion-boost-google-deloitte
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<blockquote cite="https://lighthousedata.io/data/site-speed-conversion-boost-google-deloitte" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>8%</strong> -- conversion rate lift per 0 1s speed improvement for mobile ecommerce sites<br><small>Source: Google and Deloitte (2021) · <a href="https://lighthousedata.io/data/site-speed-conversion-boost-google-deloitte" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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