flutter-intellij: Code completion on IntelliJ is very slow ~400ms per completion on ARM Macs

Steps to Reproduce

Generate default Flutter counter project and start typing.

Version info

[✓] Flutter (Channel stable, 2.5.2, on macOS 11.6 20G165 darwin-arm, locale en-FI)
    • Flutter version 2.5.2 at /opt/homebrew/Caskroom/flutter/2.5.2/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 3595343e20 (2 weeks ago), 2021-09-30 12:58:18 -0700
    • Engine revision 6ac856380f
    • Dart version 2.14.3

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/klaus/Library/Android/sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 13.0, Build version 13A233
    • CocoaPods version 1.11.2

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

[✓] Android Studio (version 2020.3)
    • 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 11.0.10+0-b96-7249189)

[✓] IntelliJ IDEA Ultimate Edition (version 2021.2.3)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin version 61.2.4
    • Dart plugin version 212.5486

[✓] Connected device (1 available)
    • Chrome (web) • chrome • web-javascript • Google Chrome 94.0.4606.81

• No issues found!