# Speed Up Your Code: Update ESLint to v9.34.0 for Multithread Linting

ESLint v9.34.0 introduces **multithread linting**, a decade-long effort to speed up linting by processing multiple files simultaneously.

## **Why it matters:**

* Multiple CPU cores? Fast SSD? You’ll see big gains.
    
* Early tests show **1.3x–3x faster linting**, especially on large projects with hundreds or thousands of files.
    

## How to

Update your eslint package in your package.json to **v9.34.0** to take advantage of **multithread linting**.

Then, update your scripts:

```json
"scripts": {
 "lint": "eslint --fix --cache --concurrency=auto"
}
```

If you’re using lint-staged for pre-commit linting, configure it like this:

```json
"lint-staged": {
 "*.{js,jsx,ts,tsx}": [

 "prettier --write",

 "eslint --fix --cache --concurrency=auto"

 ],

 "*.{json,md,css}": "prettier --write"

}
```

This will dramatically speed up linting on large projects by running multiple files in parallel. Perfect for faster pre-commit hooks and CI pipelines!