Expert answer · 2 min read
What is my PDP scroll depth distribution on mobile?
The short answer
In depth
Shopify Mobile Speed Score: SEO and Conversion Impact
Mobile page speed is a dual-threat metric: it directly affects both Google search ranking (via Core Web Vitals as a ranking signal) and on-site conversion rate. A slow mobile store pays twice - lower organic traffic and lower conversion of whatever traffic does arrive. The compound effect makes mobile speed one of the highest-ROI technical investments available.
Speed Score vs Business Impact
| PageSpeed Mobile Score | SEO Impact | Conversion Impact |
|---|---|---|
| 90-100 | Positive ranking signal | Top 10% performance |
| 75-90 | Neutral to positive | Above average |
| 50-75 | Neutral | Average - improvement opportunity |
| 30-50 | Negative for CWV pages | -15-25% vs top quartile |
| Under 30 | Ranking penalty possible | -25-40% vs top quartile |
Priority Speed Improvements for Shopify
- 1. Reduce app count: Each app adds HTTP requests and JS. Remove apps not generating measurable ROI
- 2. Optimize hero image: Compress and preload the LCP image (usually the hero product photo)
- 3. Use a fast theme: Shopify's Dawn and Sense themes score 70-85+ out of the box; older themes often score 35-50
- 4. Defer non-critical JavaScript: Review theme's script loading and add async/defer where possible
- 5. Enable Shopify CDN: All Shopify stores use their CDN by default, but ensure images are hosted on Shopify (not external URLs)
App performance consideration: Growth Suite loads its conversion scripts asynchronously to minimize impact on Core Web Vitals. When evaluating any Shopify app, run Google PageSpeed Insights before and after installation to measure speed impact. Apps with synchronous (render-blocking) JavaScript can reduce your PageSpeed score by 10-20 points, which translates to measurable conversion loss on mobile.
Speed Optimization ROI
The business case for speed investment is clear:
- - A 1-second mobile LCP improvement increases CVR by 8-12%
- - At 50,000 monthly visitors, 2% CVR, $75 AOV: each 1% CVR increase = $37,500/month additional revenue
- - Speed optimization typically costs $500-2,000 and pays back within weeks
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