App Startup

Startup is the work required to open the app and reach a useful state. A splash screen or spinner can appear quickly while useful content still takes several seconds.

Measure those moments separately. The goal is not to draw an empty frame early and call the work finished.

Distinguish startup conditions

Android commonly describes starts as cold, warm, or hot. A cold start needs a new process. A warm start reuses some process state but rebuilds the activity. A hot start brings an activity that is still in memory to the foreground