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Hi there, I previously experienced a massive memory leak in SwiftUI on macOS which now seems to be fixed. CLICK - https://developer.apple.com/forums/thread/676860 But my app still becomes slower and memory footprint grows after some time of using it. I was able to created a new minimal but more extreme example to reproduce: This is a full app for SwiftUI. Compile for macOS (I'm using Xcode 12.4 macOS 11.2.3) import SwiftUI @main struct DemoApp: App {     @State var strings = ["Hello 1", "Hello 2"]     @State var bool = false     let timer = Timer.publish(every: 0.1, on: .main, in: .common).autoconnect()     @State var selected: Int?     var body: some Scene {         WindowGroup {             List(strings.indices, id: \.self, selection: $selected) { stringIndex in                 Text(strings[stringIndex])             }             .toolbar(content: {                 ForEach(1...100, id: \.self) { _ in                     Text("Hello World")                 }             })             .onReceive(timer) { input in                 if bool == true { selected = 0 }                 else { selected = 1 }                 bool = !bool             }         }     } } Timer is optional but it will show the problem more quickly. It seems to be connected to toolbar content a lot. Memory footprint quickly goes up, as well as CPU utilization & app slows down significantly just after a few seconds. Please help! What can I do? My app is pretty much not usable because of this bug. Johannes

I've pretty much completed creating my first macOS SwiftUI app. It's working fine but after using it for more than 10 minutes I noticed a dramatic slow down and big memory footprint. I condensed the problem down into the following minimal example, which is a full SwiftUI app for both macOS and iOS. language Swift import SwiftUI @main struct TestApp: App { @State var selection: Int? var body: some Scene { WindowGroup { NavigationView { List(0...10, id: \.self) { element in NavigationLink(destination: VeryComplexView(text: "\(element)"), tag: element, selection: $selection) { Text("\(element)") } } } } } } struct VeryComplexView: View { let text: String var body: some View { HStack { ForEach(1...10, id: \.self) { _ in List(1...5000, id: \.self) { element in Text("\(text) \(element)") } } } } } On macOS after just a few clicks in the NavigationView I'm getting a memory footprint of 1GB and performance decreases. Profiling the app with Leak Detector also shows a massive amount of leaks in SwiftUI classes. Compiling the same app for iOS stays at a reasonable footprint of 50 MB even after using it for a while. This bug prevents me from properly using my app. I submitted a bug report in Feedback Assistant about a month ago with no answer or reaction. Please help! How can such a huge leak stay unnoticed. I'm running the latest Big Sur 11.2.1 and Xcode 12.4