title: react native 100+ items flatlist very slow performance
body: <p>I have a list just simple text that rendering into flatlist on react native but I am experiencing very very slow performance which makes app unusable.</p>
  
  <p>How can I solve this? My code is:</p>
  
  <pre><code>&lt;FlatList
    data={[{key: 'a'}, {key: 'b'} ... +400]}
    renderItem={({item}) =&gt; &lt;Text&gt;{item.key}&lt;/Text&gt;}
  /&gt;
  </code></pre>