SwiftUI List Performance Issues with Dynamic Data Updates in iOS 16
I've hit a wall trying to I'm deploying to production and I'm relatively new to this, so bear with me... I'm experiencing significant performance issues when updating a `List` in SwiftUI with dynamic data on iOS 16. The list is populated with a collection of items fetched from a remote API, and when I try to update this list (for example, by adding new items), the UI stutters and becomes unresponsive for a couple of seconds. Here’s a simplified version of the code I’m using: ```swift struct ContentView: View { @State private var items: [Item] = [] var body: some View { List(items) { item in Text(item.name) } .onAppear { fetchData() } } private func fetchData() { // Simulating network call DispatchQueue.global().async { let newItems = fetchNewItemsFromAPI() // This returns [Item] DispatchQueue.main.async { self.items.append(contentsOf: newItems) } } } } ``` The `fetchNewItemsFromAPI` function fetches data asynchronously and returns a new array of items. When I call `self.items.append(contentsOf: newItems)`, I notice that the UI freezes for a moment, especially when `newItems` contains a large number of elements (e.g., 50 or more). I’ve also tried using `List` with `ForEach`, but it didn’t seem to help with performance. Additionally, I'm utilizing `Identifiable` for the `Item` struct to ensure that SwiftUI can track changes efficiently: ```swift struct Item: Identifiable { let id: UUID let name: String } ``` Is there a more efficient way to add items to a `List` in SwiftUI that would minimize UI freeze? I've considered using `@Published` with `ObservableObject`, but I'm looking for best practices in this context. Any insights would be greatly appreciated! For context: I'm using Swift on Ubuntu. I'd really appreciate any guidance on this. I'm working on a application that needs to handle this. Am I missing something obvious? I'm working on a service that needs to handle this. Thanks in advance!