Every hundred milliseconds of delay erodes trust. On Shopify, that delay often comes from bloated themes, unoptimised images, third-party scripts, and sections that were never built for your actual catalogue size.
Engagement drops before conversion does
Analytics typically show session depth and scroll rate falling well before checkout abandonment spikes. Users who wait on a hero image or a sluggish collection filter rarely reach product detail pages with intent intact.
Brands that treat performance as a post-launch task pay twice: once in lost revenue, and again when retrofitting a theme that was never engineered for speed.
What to fix first
- Audit LCP on homepage, collection, and PDP templates
- Defer non-critical apps and marketing pixels
- Serve responsive images with correct dimensions
- Reduce layout shift from late-loading carousels and badges
