title: Internet explorer (10, 11) very slow to load Angular 2 app
body: <p>My app is done thanks to Angular 2 and works fine on all browsers. However, it is quite slow to load on IE  (10 and 11, I don't support below). For instance, when on Safari, Chrome and Firefox it takes ~1.5 sec to load, it takes more than 5 sec on IE (and 10 sec on Edge).
  I had a look at the network tab and found that sometimes it has a gap (0.5 to 1 sec) between two calls: </p>
  
  <p><img src="https://i.stack.imgur.com/LbJzG.png" alt="IE Slowness"></p>
  
  <p>Any idea what could delay IE between two calls? </p>
  
  <p>The only lead I have may be the shims ordering in my index.html:</p>
  
  <pre><code>        &lt;meta charset="utf-8"&gt;
          &lt;meta name="viewport" content="width=device-width"&gt;
          &lt;title&gt;AGA Front App&lt;/title&gt;
          &lt;script src='@routes.Assets.versioned("lib/angular2/es6/dev/src/testing/shims_for_IE.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("lib/es6-shim/es6-shim.min.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("lib/systemjs/dist/system.src.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("lib/typescript/lib/typescript.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("lib/angular2/bundles/angular2-polyfills.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("lib/rxjs/bundles/Rx.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("lib/angular2/bundles/angular2.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("lib/angular2/bundles/http.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("lib/angular2/bundles/router.dev.js")'&gt;&lt;/script&gt;
          &lt;script src='@routes.Assets.versioned("systemjs.config.js")'&gt;&lt;/script&gt;
          &lt;script&gt;
              System.import(path + '/assets/app/bootstrap.ts')
                      .catch(console.error.bind(console));
          &lt;/script&gt;
  </code></pre>