React Native FlatList performance implementing large datasets - need optimization tips
I'm upgrading from an older version and I'm collaborating on a project where I'm currently developing a mobile application using React Native (version 0.64) and I'm working with important performance optimization when rendering a `FlatList` with a large dataset (around 10,000 items). The app becomes unresponsive when trying to scroll through the list, which severely impacts user experience. I've tried using the `getItemLayout` prop to optimize the performance, but it doesn't seem to help much. Here's the code I'm currently using: ```javascript <FlatList data={this.state.data} renderItem={this.renderItem} keyExtractor={(item) => item.id.toString()} getItemLayout={(data, index) => ( {length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index} )} /> ``` The `ITEM_HEIGHT` is set to a fixed value since all items are of equal size. Moreover, I've also implemented `shouldComponentUpdate` in my list item component to prevent unnecessary re-renders, but the performance optimization continue. I read that using `initialNumToRender` can help, but even with that, scrolling isn't smooth. Additionally, I noticed a warning about "VirtualizedLists should never be nested" which makes me think that the scenario might be related to how I'm structuring my components. Here’s the way I’m currently nesting components: ```javascript <View> <Header /> <FlatList ... /> <Footer /> </View> ``` Is there a better approach to handle large datasets in a `FlatList`? Are there any specific optimizations that I should consider? Any help would be greatly appreciated! What are your experiences with this? My team is using Javascript for this desktop app.