Need to Stop Updating whole view while user scrolling the view SwiftUI - swiftui

Question

I'm trying to stop updating the view when the user scrolling the view. When user scrolling down to top or top to down, then whole screen updates which blocks the UI for some time. Is there any way to stop updating and when the user stops the scrolling the view automatically updating.
Code:-
struct Container1: View {
#State private var myDateForDay : String?
#State var items = Array(1...200)
#ObservedObject var data11 = DataClass.sharedInstance
var body: some View {
ZStack {
Color.init(ColorConstantsName.MainThemeBgColour)
if myDateForDay == nil {
Text("No data")
} else {
GeometryReader { geo in
ScrollView {
VStack {
Text(myDateForDay!)
ForEach(self.items.indices, id: \.self) { ride in
Text("Item \(self.items[ride])")
}
}.background(GeometryReader {
Color.clear.preference(key: ViewOffsetKey.self,value: -$0.frame(in: .named("scroll")).origin.y)
}).onPreferenceChange(ViewOffsetKey.self) {
print("offset >> \($0)")
}
}.coordinateSpace(name: "scroll")
}
}
}
.onReceive(self.data11.$myDateByDate) { response in
print("response = ",response)
myDateForDay = response
}
.onAppear{
data11.updateValue1()
}
}
}
class DataClass : NSObject, ObservableObject, UNUserNotificationCenterDelegate {
#Published var myDateByDate = "" { didSet { self.didChange.send(self) } }
var didChange = PassthroughSubject<DataClass, Never>()
override init() {
self.myDateByDate = "Starting Data"
}
func updateValue1(){
DispatchQueue.main.asyncAfter(deadline: .now()+5.0) {
self.myDateByDate = "Update Date Value"
self.updateValue12()
}
}
func updateValue12(){
DispatchQueue.main.asyncAfter(deadline: .now()+5.0) {
self.myDateByDate = "Update Date Value222"
self.updateValue1()
}
}
static let sharedInstance: DataClass = {
let instance = DataClass()
// in case we need to setup up
return instance
}()
}
Question: Stop Updating when the user scrolling the view?
Can someone please explain to me how to stop updating the view, I've tried to with above code but no results yet.
Any help would be greatly appreciated.
Thanks in advance.