Why isn't lazy load functioning on mobile for my biking website?

Technical Q&A

Topic summary

Main issue: Lazy loading (deferring images/videos until they enter the viewport) appears to work on desktop but not on mobile for a Shopify site using the Launch theme, resulting in a strong desktop PageSpeed score (88+) but a poor mobile score (<25). Theme files were uploaded for review.

Key suggestions:

  • Video impact: One reply points to embedded videos as a likely cause of mobile lag and shares a community thread on how to lazy load videos.
  • Optimization resources/services: Another reply links to a Shopify performance optimization article and offers professional help, including direct contact options and a speed-boosting app.

What’s known/unknown:

  • Known: Desktop lazy loading functions as expected; mobile performance is the problem. External resources for video lazy loading are provided.
  • Unknown: The exact reason mobile lazy loading underperforms (theme settings, script behavior on mobile, or video embed method) hasn’t been confirmed. No diagnostic details (e.g., Lighthouse trace) were shared.

Status and next steps:

  • No confirmed fix or decision yet. Suggested actions: implement proper lazy loading for videos, review theme configurations and scripts on mobile, and consider performance optimization guidance or expert assistance.
Summarized with AI on February 22. AI used: gpt-5.
2

Hi @Ethan_Simpson ,

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We will solve your lazy load issue as this is time consuming task.

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