Mobile app performance: the metrics that actually matter

· by Aditya Rao

#mobile#performance#engineering
Mobile app performance: the metrics that actually matter

Users judge an app in the first few seconds and every time it stutters. Optimise for a mid-range Android phone on a slow connection, not the flagship on your desk.

Measure these

  • Cold start to first meaningful screen.
  • Frame times — anything over 16ms is visible jank.
  • Network — number of requests on the critical path, payload sizes, cache hit rate.
  • Bundle / install size — it correlates with install completion.

Fixes that pay off

  • Defer everything not needed for the first screen — analytics SDKs, feature modules, heavy libraries.
  • Right-size and cache images; never ship a 2000px asset to a 400px slot.
  • Collapse chatty API calls into one request per screen; show cached data instantly, then refresh.
  • Move parsing and image work off the main thread.

Keep it honest

Track these metrics from real installs, segmented by device tier and country. A lab number on a fast device hides the experience most of your users are having.

Keep reading

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