B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
7%
7% -- conversion rate lift per second for Mobile ecommerce (2025)
Every 1-second improvement in mobile load time adds roughly 7% to conversion.
- Stated as an approximate rule of thumb ('adds roughly 7%')
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
7%
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Weblics Agency
Primary
Tier C
https://www.weblics.agency/blog/cro-vs-ad-spend-complete-content-package ↗
Source Article
CRO vs Ad Spend: Why Optimising Conversions Wins
Why CRO vs Ad Spend Is the Wrong Question for Most Shopify Founders
- Why more ad spend hits a wall (and CRO does not)
- The conversion rate optimisation ROI nobody calculates properly
- Paid traffic vs conversion optimisation: the $100k/month case study
- How CRO actually helps reduce customer acqu…
Original Research
Weblics Agency
· Original study ↗
Methodology
Claimed conversion gain per 1-second mobile load time improvement
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Mobile ecommerce: 7% conversion rate lift per second. Source: Weblics Agency (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/mobile-load-time-conversion-lift
HTML Embed
<blockquote cite="https://lighthousedata.io/data/mobile-load-time-conversion-lift" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>7%</strong> -- conversion rate lift per second for Mobile ecommerce<br><small>Source: Weblics Agency (2025) · <a href="https://lighthousedata.io/data/mobile-load-time-conversion-lift" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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