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Why Your Web App Is Slow — and What It's Costing You in Conversions
EngineeringPerformance

Why Your Web App Is Slow — and What It's Costing You in Conversions

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Users decide whether a site feels fast or broken in the first couple of seconds. That feeling is not cosmetic — it maps directly to revenue. Slower pages convert worse, rank lower, and cost more in ad spend to overcome. The good news: most slowness comes from a short list of fixable causes.

Where the time actually goes

  • Oversized images and media shipped at full resolution to every device.
  • Too much JavaScript — heavy bundles the browser must download, parse and run before anything is interactive.
  • Slow database queries and missing indexes behind the scenes.
  • No caching, so the server rebuilds the same response on every request.
  • Third-party scripts — analytics, chat widgets, trackers — each adding weight you did not write.

Why Google cares too

Search ranking now factors in Core Web Vitals — measurable signals for loading, interactivity and visual stability. A slow app is not just losing the users who arrive; it is getting fewer of them in the first place. Performance is an SEO feature, not just an engineering one.

Performance is the one feature every single user experiences — on every visit.

The fixes that move the needle

  • Right-size and lazy-load images; serve modern formats.
  • Trim and split JavaScript so the browser only loads what each page needs.
  • Add caching at the layers that repeat the same work.
  • Profile and index the slow queries instead of guessing.
  • Audit third-party scripts and cut the ones that do not earn their weight.

If your app feels sluggish and you are not sure why, a focused performance audit usually finds the biggest wins fast. LaunchWe can measure your Core Web Vitals, pinpoint the bottlenecks, and tell you exactly what to fix first — request an audit and we will show you the numbers.