How to solve the delay of opening a new page use FlutterEngineGroup?

[morefreeliang]

In the mutiple_flutters_android , when open then flutter page , it will need 2 seconds。

[krmao]

also, background color before engins renderd, every engine need a splash screen? ios if set Flutter ViewController clear color, when push, will see window background color

[zhangman523]

+1

[zhangman523]

I got log when DoubleFlutterActivity display.

2021-05-10 16:04:04.097 10913-10955/dev.flutter.multipleflutters I/ContentCatcher: ViewContentFetcher : ViewContentFetcher

2021-05-10 16:04:04.097 10913-10955/dev.flutter.multipleflutters D/ViewContentFactory: createInterceptor took 0ms

2021-05-10 16:04:04.426 10913-10913/dev.flutter.multipleflutters W/Looper: Slow Looper main: Activity dev.flutter.multipleflutters/.DoubleFlutterActivity is 340ms late (wall=0ms running=0ms ClientTransaction{ callbacks=[android.app.servertransaction.TopResumedActivityChangeItem] }) because of 2 msg, msg 2 took 339ms (seq=146 running=62ms runnable=7ms late=1ms h=android.app.ActivityThread$H w=159)

2021-05-10 16:04:04.455 10913-10913/dev.flutter.multipleflutters D/SurfaceView: UPDATE null, mIsCastMode = false
2021-05-10 16:04:04.886 10913-10913/dev.flutter.multipleflutters D/SurfaceView: UPDATE null, mIsCastMode = false

2021-05-10 16:04:06.308 10913-10948/dev.flutter.multipleflutters I/OpenGLRenderer: Davey! duration=2207ms; Flags=1, IntendedVsync=1522863879945643, Vsync=1522864196612297, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=1522864208345634, AnimationStart=1522864208439488, PerformTraversalsStart=1522864208932092, DrawStart=1522866074620008, SyncQueued=1522866076628133, SyncStart=1522866077221518, IssueDrawCommandsStart=1522866078070060, SwapBuffers=1522866085015581, FrameCompleted=1522866087646518, DequeueBufferDuration=5887000, QueueBufferDuration=2358000, 

2021-05-10 16:04:06.313 10913-10913/dev.flutter.multipleflutters W/Looper: Slow Looper main: Long Msg: seq=149 plan=16:04:04.100  late=329ms wall=1883ms running=23ms runnable=6ms h=android.view.Choreographer$FrameHandler c=android.view.Choreographer$FrameDisplayEventReceiver

2021-05-10 16:04:06.313 10913-10913/dev.flutter.multipleflutters W/Looper: Slow Looper main: doFrame is 329ms late because of 3 msg, msg 1 took 339ms (seq=146 running=62ms runnable=7ms late=1ms h=android.app.ActivityThread$H w=159)

2021-05-10 16:04:06.315 10913-10948/dev.flutter.multipleflutters I/OpenGLRenderer: Davey! duration=2214ms; Flags=1, IntendedVsync=1522863879945643, Vsync=1522864196612297, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=1522864208345634, AnimationStart=1522864208439488, PerformTraversalsStart=1522864208932092, DrawStart=1522866088364487, SyncQueued=1522866089999591, SyncStart=1522866090409018, IssueDrawCommandsStart=1522866090480633, SwapBuffers=1522866091295008, FrameCompleted=1522866094582612, DequeueBufferDuration=174000, QueueBufferDuration=519000, 
2021-05-10 16:04:06.319 10913-10913/dev.flutter.multipleflutters I/Choreographer: Skipped 113 frames!  The application may be doing too much work on its main thread.

2021-05-10 16:04:06.346 10913-10913/dev.flutter.multipleflutters W/Looper: Slow Looper main: doFrame is 1886ms late because of 7 msg, msg 1 took 1883ms (seq=149 running=23ms runnable=6ms late=329ms h=android.view.Choreographer$FrameHandler c=android.view.Choreographer$FrameDisplayEventReceiver)

[redbrogdon]

Thanks for filing an issue, y'all!

@gaaclarke @blasten @xster, can you recommend anything here? This looks like it might be more of a flutter/flutter issue than one for this repo.

[gaaclarke]

Can you please provide the output of flutter doctor -v and tell us how you are executing the project? I didn't see any problems when running release builds without the debugger attached. It can be very slow otherwise.

[zhangman523]

Can you please provide the output of flutter doctor -v and tell us how you are executing the project? I didn't see any problems when running release builds without the debugger attached. It can be very slow otherwise.

[admin@abc flutter]$ flutter doctor -v
[✓] Flutter (Channel stable, 2.0.6, on Mac OS X 10.15.7 19H524 darwin-x64, locale zh-Hans-CN)
    • Flutter version 2.0.6 at /Users/admin/flutter
    • Framework revision 1d9032c7e1 (13 天前), 2021-04-29 17:37:58 -0700
    • Engine revision 05e680e202
    • Dart version 2.12.3
    • Pub download mirror https://pub.flutter-io.cn
    • Flutter download mirror https://storage.flutter-io.cn

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/admin/Android-sdk/android-sdk-macosx
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = /Users/admin/Android-sdk/android-sdk-macosx
    • ANDROID_SDK_ROOT = /Users/admin/Android-sdk/android-sdk-macosx
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.

[!] Xcode - develop for iOS and macOS
    ✗ Xcode installation is incomplete; a full installation is necessary for iOS development.
      Download at: https://developer.apple.com/xcode/download/
      Or install Xcode via the App Store.
      Once installed, run:
        sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
        sudo xcodebuild -runFirstLaunch
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio
    • Android Studio at /Applications/Android Studio Preview.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)

[✓] Android Studio (version 4.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)

[✓] IntelliJ IDEA Community Edition (version 2020.2.3)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] VS Code (version 1.55.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (2 available)
    • MI 8 SE (mobile) • 2df2d0d6 • android-arm64  • Android 10 (API 29)
    • Chrome (web)     • chrome   • web-javascript • Google Chrome 90.0.4430.212

! Doctor found issues in 2 categories.

[krmao]

flutter/flutter#72009 (comment)

[morefreeliang]

I found the reason, this is because I am in the debug environment, if I am in the release environment, it will be ok