Running/Debugging Flutter app very slow after upgrading to latest SDK version 1.20.4

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I'm facing this problem after upgrading to latest stable version 1.20.4 Earlier I was using Flutter 1.12.13+hotfix.5 and debug/run speed was good enough. Is anyone else also facing this issue? Or could anyone help by suggesting some solutions or reasons as to why this is happening? I am using a Windows 10 machine. Running flutter doctor -v yields the following output

    • Flutter version 1.20.4 at D:\flutter
    • Framework revision fba99f6cf9 (8 days ago), 2020-09-14 15:32:52 -0700
    • Engine revision d1bc06f032
    • Dart version 2.9.2

 
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at C:\Users\amani\AppData\Local\Android\Sdk
    • Platform android-29, build-tools 29.0.2
    • ANDROID_HOME = C:\Users\amani\AppData\Local\Android\Sdk
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
    • All Android licenses accepted.

[√] Android Studio (version 3.5)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 42.1.1
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

[√] VS Code (version 1.49.1)
    • VS Code at C:\Users\amani\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.14.1

[√] Connected device (1 available)
    • Android SDK built for x86 (mobile) • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)

• No issues found!```
2 Answers

i had a simular issue , for me i return to the previous stable version and everything goes good , run flutter downgrade to return to the previous fluter version install on your machine

Solved the issue by deleting Flutter SDK and then replacing it with newly downloaded SDK. It seems that upgrade caused some files to get corrupted in the SDK directory.

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