Dear Experts, I created a SwiftUI View (in a UIKit based project) whose objective is to display a short animation in the front of the user screen. I developed it 8 month ago in XCode 15 for iOS 17, no problems. But since iOS 18, I can observe huge lags on my animation only in Release app. The problem is not present in Debug app. I don't understand why this problem occurs, the animation is quite simple, it's just an offset deplacement. I tried many thing like: Show the animation with a UINavigationController Show the animation with a UIWindow Move the view with .position Remove the GeometryReader All other animation withAnimation and .animation Task and DispatchQueue Etc... I found that the laggy animation occurs when I set the Optimization Level for the Swift Compiler - Code Generation to Optimize for Speed [-O]. That's very strange because we had this option on Release for iOS 17 and we had no lags... I can share to you a Sample Repository with the configuration we have. https://github.com/Thibma/sample-animation-swiftui Today the only option I used is to develop this feature in UIKit but it's too bad to skip the SwiftUI opportunity. :/ If you have any ideas to resolve this, I take ! Thank you !