Laravel Mix (gulp) running really slow?

npm run prod is taking 1.5 minutes to run on server and npm run dev isn't working as expected... What would you do to improve the speed? This is a laravel 5.2.45 project... Node v 8.11.2

package.json

{
  "private": true,
  "scripts": {
    "prod": "gulp --production",
    "dev": "gulp watch"
  },
  "devDependencies": {
    "gulp": "^3.9.1",
    "gulp-sass": "^3.1.0",
    "laravel-elixir": "^5.0.0",
    "bootstrap-sass": "^3.0.0"
  },
  "dependencies": {
    "@stripe/react-stripe-js": "^1.1.2",
    "@stripe/stripe-js": "^1.5.0",
    "@types/react": "^16.9.35",
    "natives": "^1.1.6",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-number-format": "^3.6.1",
    "react-stripe-elements": "^2.0.3",
    "rrule": "^2.2.9",
    "sortablejs": "^1.10.1"
  }
}

var elixir = require('laravel-elixir');

/*
 |--------------------------------------------------------------------------
 | Elixir Asset Management
 |--------------------------------------------------------------------------
 |
 | Elixir provides a clean, fluent API for defining some basic Gulp tasks
 | for your Laravel application. By default, we are compiling the Sass
 | file for our application, as well as publishing vendor resources.
 |
 */
var path = require('path');
elixir(function (mix) {
    mix.browserify('./resources/assets/react/v2/v2.js', './public/js/react/v2.js', false, {
        // paths: [path.resolve(__dirname, 'resources/assets/js')]
        paths: ['./resources/assets/react/v2/']
    });

    mix.browserify('./resources/assets/react/vendor/v2_vendor.js', './public/js/react/v2_vendor.js', false, {
        // paths: [path.resolve(__dirname, 'resources/assets/js')]
        paths: ['./resources/assets/react/vendor/']
    });

    mix.browserify('./resources/assets/react/admin.js', './public/js/react/admin.js')
        .browserify('./resources/assets/react/agent.js', './public/js/react/agent.js')
        .browserify('./resources/assets/react/vendor.js', './public/js/react/vendor.js')
        .browserify('./resources/assets/react/public.js', './public/js/react/public.js')
        .sass('brandname.scss')
        .sass('public.scss')
        .sass('vendor.scss');
});