Extension causes high cpu load

[vixflo]

• Issue Type: Performance
• Extension Name: html-slim-scss-css-class-completion
• Extension Version: 1.7.8
• OS Version: Windows_NT x64 10.0.19045
• VS Code version: 1.78.2

⚠️ Make sure to attach this file from your home-directory:
⚠️file:///c%3A/Users/ssflo/AppData/Local/Temp/gencer.html-slim-scss-css-class-completion-unresponsive.cpuprofile.txt

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