I noticed that ElixirLS hangs on "Running Code Actions and Formatters..." during my development workflow. It happens especially when doing a search and replace that affects many files.

Sometimes, even when saving a single file, ElixirLS hangs for 10 seconds or so with the following notifications:

• Running 'ElixirLS: Elixir support and debugger' Formatter (configure).
• Saving 'filename': Running Code Actions and Formatters...

E.g.

When affecting several files, there is the same set of notifications for each file. Therefore, clicking Skip of each notifications (with the idea of running a single mix format later on) is not practical solution.

Despite several hours spent on it, I cannot find a way to properly reproduce the issue and provide a repo for testing. But the project size seems to affect this.

• My project size:

$ find lib -type f -name '*.ex' | wc -l
516

$ find test -type f -name '*.exs' | wc -l
616

• My config:

$ cat .vscode/settings.json 
{
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "editor.formatOnSave": true,
  "prettier.ignorePath": "assets/.prettierignore",
  "eslint.workingDirectories": [{ "mode": "auto" }],
  "[elixir]": {
    "editor.defaultFormatter": "JakeBecker.elixir-ls"
  }
}

$ cat .formatter.exs 
[
  import_deps: [:ecto, :ecto_sql, :phoenix],
  inputs: ["*.{ex,exs}", "{config,lib,test}/**/*.{ex,exs}", "priv/*/seeds.exs"]
]

• ElixirLS: 0.29.3

• VSCodium:

  Version: 1.104.16282
  Commit: b18126fb99b60533fc069575d08d72758cd90fed
  Date: 2025-09-18T18:33:00.492Z
  Electron: 37.3.1
  ElectronBuildId: undefined
  Chromium: 138.0.7204.235
  Node.js: 22.18.0
  V8: 13.8.258.31-electron.0
  OS: Linux x64 6.12.50