title: Adding a big list to ion select makes app slow
body: <p>I have a large number of list in my ion-options, which makes my view very slow, if I add 4 items in ion-option my view in my mobile works fast, but when I add a large number of list in my html file the app slows down,</p>
  
  <pre><code>&lt;ion-item&gt;
                  &lt;ion-label style="color: black;" &gt;Country&lt;/ion-label&gt;
                  &lt;ion-select name="Country" placeholder="select a Country" [(ngModel)]="Country" required&gt;
                      &lt;ion-option value="United States"&gt;United States&lt;/ion-option&gt;
                      &lt;ion-option value="Afghanistan"&gt;Afghanistan&lt;/ion-option&gt;
                      &lt;ion-option value="Albania"&gt;Albania&lt;/ion-option&gt;
                      &lt;ion-option value="Algeria"&gt;Algeria&lt;/ion-option&gt;
                  .
                  ./* list of all countries are needed */
                  .                    
                  &lt;/ion-select&gt;
              &lt;/ion-item&gt;
  </code></pre>
  
  <p>Is there any possibilities to load all countries and make the app to work fast.
  Totally we have 196 country in world, what should I do to load everything</p>