Hi I am developing an app with swiftUI. Here is the code of a map view. I create customized annotations and show them on the map view. The issue is that when I drag or zoom in/ out on the map view. The app is so slow. The fps decrease to about 20 - 30 from 60. I use instruments to analyze this app. The result shows that there are thousands of times annotation render. I think that the reason for this issue may be off-screen rendering. But I don't know how to solve it. Looking forward to your help. swift Map(coordinateRegion: $region, interactionModes: .all, showsUserLocation: true, userTrackingMode: $trackingMode, annotationItems: result, annotationContent: { mark in MapAnnotation(coordinate: CLLocationCoordinate2D(latitude: mark.lat, longitude: mark.long)) {   Button {withAnimation { self.selectedGymUid = Int(mark.uid) }} label: {RoundedGymIconOnMapView(name:mark.name) .clipShape(Circle()) .overlay(Circle().stroke(selectedGymUid == Int(mark.uid) ? Color(.green).opacity(0.5) : AppColor.shared.joggingColor.opacity(0.5),lineWidth: 1.4)) .scaleEffect(selectedGymUid == Int(mark.uid) ? 2 : 1) .shadow(radius: 5) } } })