oh-my-zsh comes with minimal set of default plugins. The others you can add. Check out oh-my-zsh github page for themes and plugins. I guess the comment in your

oh-my-zsh comes with minimal set of default plugins. The others you can add. Check out oh-my-zsh github page for themes and plugins. I guess the comment in your plugin configuration section will also warn you about adding too many plugins having performance impact.