Measure flutter application startup time

Question

I am looking for some way to measure startup time of an application. From a moment of clicking the app icon till the moment, when for example login page is visible to the user.

If you are using Android Studio, IntelliJ I think you can Flutter Performance, Dart Dev Tools. — Blasanka, Sep 11 '19 at 01:12
When I use Flutter Performance and quit Flutter app, connection with debugger is lost. — Artur Tomczak, Sep 11 '19 at 01:29

score 14 · Answer 1 · answered May 16 '20 at 01:10

Run

flutter run --trace-startup --profile

The trace output is saved as a JSON file called start_up_info.json under the build directory of your Flutter project. The output lists the elapsed time from app startup to these trace events (captured in microseconds):

Time to enter the Flutter engine code.
Time to render the first frame of the app.
Time to initialize the Flutter framework.
Time to complete the Flutter framework initialization.

For example:

content_copy
{
  "engineEnterTimestampMicros": 96025565262,
  "timeToFirstFrameMicros": 2171978,
  "timeToFrameworkInitMicros": 514585,
  "timeAfterFrameworkInitMicros": 1657393
}

Source

Measure flutter application startup time

1 Answers1

Linked