docs: update CPU profiling section

This section is outdated.

Closes #20336

Author: alan-agius4

packages/angular/cli/README.md

@@ -234,26 +234,26 @@ For more informations about Node.js debugging in VS Code, see the related [VS Co
 
 In order to investigate performance issues, CPU profiling is often useful.
 
-To capture a CPU profiling, you can:
+#### Creating a profile
 
-1. install the v8-profiler-node8 dependency: `npm install v8-profiler-node8 --no-save`
-1. set the NG_CLI_PROFILING Environment variable to the file name you want:
-   - on Unix systems (Linux & Mac OS X): ̀`export NG_CLI_PROFILING=my-profile`
-   - on Windows: ̀̀`setx NG_CLI_PROFILING my-profile`
+Node.js 16+ users can use the Node.js command line argument `--cpu-prof` to create a CPU profile.
 
-Then, just run the ng command on which you want to capture a CPU profile.
-You will then obtain a `my-profile.cpuprofile` file in the folder from which you ran the ng command.
+```bash
+node --cpu-prof node_modules/.bin/ng build
+```
+
+In addition to this one, another, more elaborated way to capture a CPU profile using the Chrome Devtools is detailed in https://github.com/angular/angular-cli/issues/8259#issue-269908550.
+
+#### Opening a profile
 
 You can use the Chrome Devtools to process it. To do so:
 
-1. open `chrome://inspect/#devices` in Chrome
+1. open `chrome://inspect` in Chrome
 1. click on "Open dedicated DevTools for Node"
 1. go to the "profiler" tab
-1. click on the "Load" button and select the generated .cpuprofile file
+1. click on the "Load" button and select the generated `.cpuprofile` file
 1. on the left panel, select the associated file
 
-In addition to this one, another, more elaborated way to capture a CPU profile using the Chrome Devtools is detailed in https://github.com/angular/angular-cli/issues/8259#issue-269908550.
-
 ## Documentation
 
 The documentation for the Angular CLI is located on our [documentation website](https://angular.io/cli).