Flatlist-fast base on FLatList, so it has all the properties of the FlatList.
FLatlist-fast will render when you scroll to end or 'onEndReachedThreshold'.
Every one rendered, Flatlist-fast will render 'itemOnePage' more element.
If you don't set the 'initialNumToRender' property, Flatlist-fast will render initial item number equal to 'itemOnePage' property
import FlatListFast from 'flatlist-fast';
<FlatListFast
ref={ref => this.flatList = ref}
removeClippedSubviews={false}
showsVerticalScrollIndicator={false}
showsHorizontalScrollIndicator={false}
scrollEventThrottle={16}
getItemLayout={(data, index) => (
{ length: 50, offset: index * 50, index }
)}
data={this.state.listData}
renderItem={({ item, index }) =>
<Text>
{`example ${index}: ${item}`}
</Text>}
keyExtractor={item => item.id}
style={styles.container}
itemOnePage={12}
initialNumToRender={20}
onEndReachedThreshold={0.4}
/>
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