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Performance8 min read

Hitting sub-1s LCP on the PDP — without ripping out apps

Surgical performance work that lifted PDP LCP from 3.4s to 0.9s.

Hitting sub-1s LCP on the PDP — without ripping out apps

We took a client PDP from 3.4s LCP to 0.9s without ripping out apps. Here’s the surgical pass.

The work

  • Preload hero image with fetchpriority="high".
  • Defer all third-party scripts.
  • Inline critical CSS for above-fold.
  • Move review widget below the fold.
  • Replace JPEG with AVIF.
  • Lazy-load gallery thumbnails.

The hard call

We left the personalization app installed. It cost ~150ms but drove +9% CR. Performance is a tradeoff, not a religion.

Speed for speed’s sake is a vanity metric. Speed in service of revenue is the goal.
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