title: react-native app lags on android
body: <p>I wrote simple app on react-native. It consists of <code>&lt;ListView&gt;</code> that shows <code>&lt;Image&gt;</code> in rows. Images are fetched from the network. It runs on iOS very well. But on Android if stucks when image appears. FPS is 0.9-3.2;
  I used systrace tool to figure out what is going on. Here is a  screenshot of it.</p>
  <p><a href="https://i.stack.imgur.com/k1ECw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/k1ECw.png" alt="enter image description here" /></a></p>
  <p>It looks like everything is done on UI thread.</p>
  <p>Here is a render function of my class:</p>
  <pre><code>render() {
      return (
          &lt;View style={styles.container}&gt;
              &lt;ListView
                  style={styles.list}
                  dataSource={this.state.dataSource}
                  renderRow={this.renderRow.bind(this)}
                  /&gt;
          &lt;/View&gt;
      );
  }
  
  renderRow(rowData) {
      return &lt;Image
        style={{ width: 320, height: 320 }}
        source={{uri: rowData.coverPhoto}} /&gt;
  }
  </code></pre>
  <p>I have aa filling that I missed something. Can somebody help me figure out what exactly ?
  Thanks!</p>