Scrolling stutters in a LazyVGrid on iOs 14, beta 5 due to the cell's context menu. If you comment it out, scrolling performance dramatically increases.

LazyVGridStutter.swift

struct ContentView: View{
    @State private var selection: Int? = nil
    
    var body: some View{
        NavigationView{
            List{
                Text("Does")
                Text("Not")
                Text("Matter")
                Text("For")
                Text("This")
                Text("Example")
            }.listStyle(SidebarListStyle())
            
            ScrollView{
                Text("In this example, scrolling stutters due to the cell's context menu. If you comment it out, scrolling performance dramatically increases. (SwiftUI, iOS 14, beta 5)")
                    .font(.title3)
                
                LazyVGrid(columns: [GridItem(.adaptive(minimum: 140))], spacing: 30, content: {
                    ForEach(0..<199) { index in
                        NavigationLink(
                            destination: Text("\(index)"),
                            tag: index,
                            selection: $selection
                        ) {
                            ContextMenuCell(index: index)
                        }.buttonStyle(PlainButtonStyle())
                    }
                }).padding()
            }.navigationTitle("Scrolling Stutter")
        }
    }
}

struct ContextMenuCell: View{
    let index: Int
    let colors = [Color.blue, .gray, .red, .green, .pink, .purple, .orange]
    
    var body: some View{
        colors.randomElement()!
            .frame(height: 100)
            .contextMenu{
                ContextMenuButton(title: "Favorite") {}
                ContextMenuButton(title: "Edit"){}
                Menu{
                    ContextMenuButton(title: "File 1"){}
                    ContextMenuButton(title: "File 2"){}
                } label: {
                    Text("Share")
                    Image(systemName: "flame")
                        .imageScale(.large)
                }
                Divider()
                ContextMenuButton(title: "Delete") {}
            }
    }
}

struct ContextMenuButton: View {
    let title: String
    let action: () -> Void
    
    var body: some View {
        Button(action: {
            self.action()
        }, label: {
            Label(title, systemImage: "photo")
                .imageScale(.large)
        })
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}