# SwiftUI and AnyView: Performance benchmarks

**URL:** <https://forums.swift.org/t/swiftui-and-anyview-performance-benchmarks/65717>\
**Category:** Using Swift\
**Tags:** swiftui\
**Created:** [June 20, 2023, 11:31pm UTC](https://forums.swift.org/t/swiftui-and-anyview-performance-benchmarks/65717 "2023-06-20T23:31:08Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![tera](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/tera/32/38201_2.png) [@tera](https://forums.swift.org/u/tera)\
**Post date:** [June 21, 2023, 2:24am UTC](https://forums.swift.org/t/swiftui-and-anyview-performance-benchmarks/65717/3 "2023-06-21T02:24:24Z")

</div>

This app illustrates real slowdown cause by AnyView.

> **The app**
>
> ```swift
> import SwiftUI
> 
> class Model {
> static let shared = Model()
> let items1K = (0 ..< 1000).map { Item(id: $0) }
> let items10K = (0 ..< 10_000).map { Item(id: $0) }
> let items100K = (0 ..< 100_000).map { Item(id: $0) }
> let items1000K = (0 ..< 1000_000).map { Item(id: $0) }
> }
> 
> struct Item: Identifiable {
> var id: Int
> var text: String { String(id) }
> }
> 
> struct NormalItemView: View {
> let item: Item
>     
> var body: some View {
> HStack {
> VStack {
> Text(item.text)
> }
> }
> }
> }
> 
> struct AnyItemView: View {
> let item: Item
>     
> var body: some View {
> AnyView(Text(item.text))
> }
> }
> 
> struct NormalListView: View {
> var items: [Item]
>     
> var body: some View {
> List(items) { item in
> NormalItemView(item: item)
> }.listStyle(.plain)
> }
> }
> 
> struct AnyListView: View {
> var items: [Item]
>     
> var body: some View {
> List(items) { item in
> AnyItemView(item: item)
> }.listStyle(.plain)
> }
> }
> 
> struct ContentView: View {
> private var model = Model.shared
>     
> var body: some View {
> NavigationView {
> VStack(spacing: 20) {
> NavigationLink { NormalListView(items: model.items1K) } label: { Text("NormalView 1K") }
> NavigationLink { NormalListView(items: model.items10K) } label: { Text("NormalView 10K") }
> NavigationLink { NormalListView(items: model.items100K) } label: { Text("NormalView 100K") }
> NavigationLink { NormalListView(items: model.items1000K) } label: { Text("NormalView 1000K") }
>                 
> NavigationLink { AnyListView(items: model.items1K) } label: { Text("AnyView 1K") }
> NavigationLink { AnyListView(items: model.items10K) } label: { Text("AnyView 10K") }
> NavigationLink { AnyListView(items: model.items100K) } label: { Text("AnyView 100K") }
> NavigationLink { AnyListView(items: model.items1000K) } label: { Text("AnyView 1000K") }
> }
> }
> }
> }
> 
> struct ContentView_Previews: PreviewProvider {
> static var previews: some View {
> ContentView()
> }
> }
> 
> @main struct LSTApp: App {
> var body: some Scene {
> WindowGroup { ContentView() }
> }
> }
> 
> ```

When showing a list with 1K items AnyView version is quick, with 10K items it's just a tad slower, but then it's significantly slower with 100K and 1000K items; while "normal" view version is equally fast with any number of items.

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