Description

I have been using VS Code's Python extensions (for live code interpretation, syntax highlighting, and import resolution) alongside the EditorConfig extension for years without any issues.

About two months ago, I started experiencing significant performance degradation when writing Python code: syntax highlighting would stop working, imports would not be resolved, and general editor responsiveness was noticeably impaired.

After investigating, I identified the EditorConfig extension as the root cause. Once I uninstalled it, everything returned to normal immediately.
Steps to reproduce:

1. Install the EditorConfig for VS Code extension alongside the Python extension(s)
2. Open a Python project and start editing code
3. Observe degraded performance (missing syntax highlighting, unresolved imports, slow IntelliSense)

Expected behavior: Both extensions coexist without performance impact.
Actual behavior: The EditorConfig extension causes severe slowdowns that make the Python extensions nearly unusable.

Environment

VS Code version: 1.113.0
EditorConfig extension version: 0.18.1
Python Extension Pack version: 1.7.0
OS: Ubuntu 20.04, 22.04, and Red Hat

Additional context: This issue appeared roughly two months ago and may be related to a recent update to either extension. I have not yet identified which specific version introduced the regression.