title: why is babel transpilation very slow?
body: <p>I've started coding with es6 and angular and using babel for transpilation of my es6 code. I'm seeing a lot of delay in transpilation as my code base is increasing. This transpilation is taking more than a minute.
  I'm using grunt and configured a task for babel.
  Is there anything wrong i'm doing here? please suggest. </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>babel: {
              options: {
                  sourceMap: false,
                  presets: ['es2015']
              },
              dist: {
                  files: [
                      {
                          expand: true,
                          cwd: 'client/',
                          src: ['table/**/*.js'],
                          dest: 'dist/'
                      },
                      {
                          expand: true,
                          cwd: 'client/',
                          src: ['main.js'],
                          dest: 'dist/'
                      }
                  ]
              }
          },</code></pre>
  </div>
  </div>
  </p>