The IDE code completion is more slow on flutter SDK 2.5

[luckysmg]

My IDE is Idea

I have tried many times.

When i switch to flutter SDK 2.5,the code completion tip will take more time to come out...
But when I switch to flutter SDK 2.2.3，it come out very quickly....

flutter doctor:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.5.0, on macOS 11.5.2 20G95 darwin-x64, locale
    zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ 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
[✓] Chrome - develop for the web
[✓] Android Studio (version 2020.3)
[✓] IntelliJ IDEA Ultimate Edition (version 2021.2.1)
[✓] Connected device (3 available)

[maheshj01]

Hi @luckysmg, Thanks for filing the issue I could not reproduce the issue, When I hit ctrl+space I see suggestion coming out immediately no difference on flutter 2.2.3 and 2.5.0

Screen.Recording.2021-09-09.at.4.30.21.PM.mov

Also no issue selecting the suggestions

Screen.Recording.2021-09-09.at.4.38.50.PM.mov

Let me know if I am missing anything.

flutter doctor -v

[✓] Flutter (Channel stable, 2.5.0, on macOS 11.5.2 20G95 darwin-arm, locale en-GB)
    • Flutter version 2.5.0 at /Users/mahesh/Documents/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 4cc385b4b8 (29 hours ago), 2021-09-07 23:01:49 -0700
    • Engine revision f0826da7ef
    • Dart version 2.14.0

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Users/mahesh/Library/Android/sdk
    • Platform android-31, build-tools 31.0.0
    • ANDROID_HOME = /Users/mahesh/Library/Android/sdk
    • 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)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5.1, Build version 12E507
    • CocoaPods version 1.10.2

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

[✓] 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 2021.2.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 60.1.4
    • Dart plugin version 212.5080.8

[✓] VS Code (version 1.59.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.26.0

[✓] Connected device (3 available)
    • iPhone 12 Pro (mobile) • B622CBB7-F906-4FA7-8F49-FACEAAC905AB • ios            • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)        • macos                                • darwin-arm64   • macOS 11.5.2 20G95 darwin-arm
    • Chrome (web)           • chrome                               • web-javascript • Google Chrome 93.0.4577.63

• No issues found!

[luckysmg]

emm，If I write code from nothing,it will be slow.....

here is the video

2.2.3:

2.2.3video.mp4

2.5:

2.5video.mp4

[maheshj01]

Thanks for the video @luckysmg, I can reproduce it on the stable 2.5 and see a delay, initially, I thought this is the IntelliJ Plugin issue, but since the flutter version is showing the difference this is probably an issue with the tooling,

	Intellij Code Completion
Flutter 2.2.3	Screen.Recording.2021-09-10.at.11.48.04.AM.mov
Flutter 2.5.0	Screen.Recording.2021-09-10.at.11.46.37.AM.mov

flutter doctor -v

[✓] Flutter (Channel stable, 2.2.3, on macOS 11.5.2 20G95 darwin-arm, locale en-GB)
    • Flutter version 2.2.3 at /Users/mahesh/Documents/flutter_dev
    • Framework revision f4abaa0735 (2 months ago), 2021-07-01 12:46:11 -0700
    • Engine revision 241c87ad80
    • Dart version 2.13.4

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Users/mahesh/Library/Android/sdk
    • Platform android-31, build-tools 31.0.0
    • ANDROID_HOME = /Users/mahesh/Library/Android/sdk
    • 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)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5.1, Build version 12E507
    • CocoaPods version 1.10.2

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

[✓] 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 2021.2.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 60.1.4
    • Dart plugin version 212.5080.8

[✓] VS Code (version 1.59.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.26.0

[✓] Connected device (3 available)
    • iPhone 12 Pro (mobile) • B622CBB7-F906-4FA7-8F49-FACEAAC905AB • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)        • macos                                • darwin-arm64   • macOS 11.5.2 20G95
      darwin-arm
    • Chrome (web)           • chrome                               • web-javascript • Google Chrome
      93.0.4577.63

• No issues found!

[✓] Flutter (Channel stable, 2.5.0, on macOS 11.5.2 20G95 darwin-arm, locale en-GB)
    • Flutter version 2.5.0 at /Users/mahesh/Documents/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 4cc385b4b8 (2 days ago), 2021-09-07 23:01:49 -0700
    • Engine revision f0826da7ef
    • Dart version 2.14.0

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Users/mahesh/Library/Android/sdk
    • Platform android-31, build-tools 31.0.0
    • ANDROID_HOME = /Users/mahesh/Library/Android/sdk
    • 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)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5.1, Build version 12E507
    • CocoaPods version 1.10.2

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

[✓] 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 2021.2.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 60.1.4
    • Dart plugin version 212.5080.8

[✓] VS Code (version 1.59.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.26.0

[✓] Connected device (3 available)
    • iPhone 12 Pro (mobile) • B622CBB7-F906-4FA7-8F49-FACEAAC905AB • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)        • macos                                • darwin-arm64   • macOS 11.5.2 20G95
      darwin-arm
    • Chrome (web)           • chrome                               • web-javascript • Google Chrome
      93.0.4577.63

• No issues found!

[atreeon]

Thanks @maheshmnj . A +1 from me here. I was using Flutter 2.2.1 which was a little bit slow but 2.5 is making intellisense and code completion unusable (its easier to type in the results). I do have a large project but it was kind of ok previously.

[xianshui]

Encountered the same issue(seems OK on vs code), is there any solution for it?

[zanderso]

/cc @jacob314

[jacob314]

cc @stevemessick

[stevemessick]

@jwren Could you look into this? @jacob314 and I were just chatting and realized this is unlikely to be a Flutter plugin issue.

[jwren]

Yes, assigned to myself. I will chat with Brian and figure out what has changed in the completion algorithm to fix this.

[devoncarew]

From running this locally on a helloworld flutter app (flutter master; dart plugin 212.4746.57; IntelliJ 2021.2 CE):

• I do see rough wall clock times of ~1s or slightly longer for completions (I did not do exact measurements end-to-end from IntelliJ, but that should be easy enough from the plugin itself)
• completion times are high for the portion of time just in the analysis server; 300-400ms for the first completion after an edit, and 150ms for 2nd and later completions. even without the likely very high decoding time on the IntelliJ side, this is well past our 100ms completion target

Assuming that the end-to-end times come in where I suspect they are, I think it's safe to say that most dart and flutter developers now see completion times above 1 second.