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