vue-cli: New Vue App created using CLI3 is slowing down Chrome and Saari

Version

3.2.1

Reproduction link

https://github.com/Shreerang/Vue-Nuggets

Environment info

  System:
    OS: macOS Sierra 10.12.6
    CPU: (8) x64 Intel(R) Core(TM) i7-6920HQ CPU @ 2.90GHz
  Binaries:
    Node: 10.12.0 - ~/.nvm/versions/node/v10.12.0/bin/node
    Yarn: Not Found
    npm: 6.4.1 - ~/.nvm/versions/node/v10.12.0/bin/npm
  Browsers:
    Chrome: 71.0.3578.98
    Firefox: 64.0
    Safari: 12.0
  npmPackages:
    @vue/babel-preset-app:  3.2.0 
    @vue/cli-overlay:  3.2.0 
    @vue/cli-plugin-babel: ^3.2.0 => 3.2.0 
    @vue/cli-plugin-eslint: ^3.2.0 => 3.2.1 
    @vue/cli-plugin-unit-jest: ^3.2.0 => 3.2.0 
    @vue/cli-service: ^3.2.0 => 3.2.0 
    @vue/cli-shared-utils:  3.2.0 
    @vue/component-compiler-utils:  2.3.1 
    @vue/eslint-config-prettier: ^4.0.0 => 4.0.1 
    @vue/preload-webpack-plugin:  1.1.0 
    @vue/test-utils: ^1.0.0-beta.20 => 1.0.0-beta.27 
    @vue/web-component-wrapper:  1.2.0 
    babel-helper-vue-jsx-merge-props:  2.0.3 
    babel-plugin-transform-vue-jsx:  4.0.1 
    eslint-plugin-vue: ^5.0.0-0 => 5.0.0 
    jest-serializer-vue:  2.0.2 
    vue: ^2.5.17 => 2.5.21 
    vue-eslint-parser:  2.0.3 
    vue-hot-reload-api:  2.3.1 
    vue-jest:  3.0.2 
    vue-loader:  15.4.2 
    vue-router: ^3.0.1 => 3.0.2 
    vue-style-loader:  4.1.2 
    vue-template-compiler: ^2.5.17 => 2.5.21 
    vue-template-es2015-compiler:  1.6.0 
    vuex: ^3.0.1 => 3.0.1 
  npmGlobalPackages:
    @vue/cli: 3.2.1

Steps to reproduce

Scaffold a new app using Vue CLI with any combination and do npm serve. Open localhost:8080 in Chrome. Open another tab or go to other existing tabs in the browser. You will notice slowness!

This same issue is reproducible on previously scaffolded apps too! 😦

What is expected?

The Browser should not slow down!

What is actually happening?

The Browser is slowing down! If you kill the execution in terminal, the browser is back to original state!