• Issue Type: Performance
• Extension Name: dart-code
• Extension Version: 3.3.0
• OS Version: Darwin x64 17.7.0
• VSCode version: 1.37.1

⚠️ Make sure to attach this file from your home-directory:
⚠️/Users/sephirothtbm/Dart-Code.dart-code-unresponsive.cpuprofile.txt

Find more details here: https://github.com/Microsoft/vscode/wiki/Explain:-extension-causes-high-cpu-load