I need to switch from  and to stable and master channels frequently, to use some new features or to be able to run some projects (like flutter/gallery).
and every time I run the command flutter channel master/stable followed by flutter upgrade, it seems that a new Dart SDK is being downloaded with a lot of other suff (see the output bellow), so, the switching doesn't come at ease, and I have to wait, even the time between channels is seconds!
> flutter channel stable
Switching to flutter channel 'stable'...
git: Your branch is up to date with 'origin/stable'.
git: Switched to branch 'stable'
Successfully switched to flutter channel 'stable'.
To ensure that you're on the latest build from this channel, run 'flutter upgrade'
PS D:\DevLib\Flutter\flutter_course> flutter doctor        
Checking Dart SDK version...
Downloading Dart SDK from Flutter engine 6bc433c6b6b5b98dcf4cc11aff31cdee90849f32...
Unzipping Dart SDK...
Building flutter tool...
Running pub upgrade...
  ╔════════════════════════════════════════════════════════════════════════════╗
  ║                 Welcome to Flutter! - https://flutter.dev                  ║
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  ║ The Flutter tool uses Google Analytics to anonymously report feature usage ║
  ║ statistics and basic crash reports. This data is used to help improve      ║
  ║ Flutter tools over time.                                                   ║
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  ║ Flutter tool analytics are not sent on the very first run. To disable      ║
  ║ reporting, type 'flutter config --no-analytics'. To display the current    ║
  ║ setting, type 'flutter config'. If you opt out of analytics, an opt-out    ║
  ║ event will be sent, and then no further information will be sent by the    ║
  ║ Flutter tool.                                                              ║
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  ║ Note: The Google Privacy Policy describes how data is handled in this      ║
  ║ service.                                                                   ║
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  ║ Moreover, Flutter includes the Dart SDK, which may send usage metrics and  ║
  ║ crash reports to Google.                                                   ║
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  ║ Read about data we send with crash reports:                                ║
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  ╚════════════════════════════════════════════════════════════════════════════╝
Downloading package sky_engine...                                   1.6s
Downloading flutter_patched_sdk tools...                            6.4s
Downloading flutter_patched_sdk_product tools...                    6.4s
Downloading windows-x64 tools...                                   14.9s
Downloading windows-x64/font-subset tools...                        2.3s
Downloading android-arm-release/windows-x64 tools...                1.5s
Downloading android-arm64-profile/windows-x64 tools...              1.9s
Downloading android-arm64-release/windows-x64 tools...              1.5s
Downloading android-x64-profile/windows-x64 tools...                1.9s
Downloading android-x64-release/windows-x64 tools...                1.7s
Doctor summary (to see all details, run flutter doctor -v):