Opening many editors cripples my machine

Environment

• OS and Version: Windows_NT x64 10.0.19043
• VS Code Version: 1.70.2
• C/C++ Extension Version: 1.11.5

Bug Summary and Steps to Reproduce

Bug Summary:
When opening many editors the extension spins up so many Intellisense processes my PC becomes unresponsive and unusable until I kill them manually or close VSCode. These processes linger even after closing editors.

Steps to reproduce:

1. Open many editors (10-30)
2. Notice the number of Intellisense processes running in the background and the resulting CPU usage
3. Close all editors
4. Notice the Intellisense processes stick around for a long time (possibly until they finish?)

For additional context, this happens in an Unreal Engine codebase (where includes are notoriously heavy and Intellisense has its work cut out for it) while making sweeping refactoring changes. I end up opening 10-20 files at a time, making the same change to each of them, then closing them and starting another batch.

Expected behavior

1. The number of Intellisense processes for unfocused editors is limited to a reasonable number based on the available CPU cores.
2. Intellisense processes are closed immediately when an editor is closed.

Code sample and Logs

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Screenshots

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Additional context

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Beginne damit, das Problem in den gemeldeten Versionen von Windows, VS Code und der C/C++-Erweiterung mit 10–30 Editoren in einer Unreal Engine-Codebasis zu reproduzieren. Verfolge, wie IntelliSense-Prozesse für nicht fokussierte Editoren erstellt werden und was passiert, wenn Editoren geschlossen werden. Als abgeschlossen gilt die Arbeit, wenn nicht fokussierte Arbeit durch die verfügbaren CPU-Kerne angemessen begrenzt wird und Prozesse nach dem Schließen von Editoren zeitnah beendet werden.