Application.GetAllTopLevelWindows() is slow about flaui HOT 9 OPEN

Could you provide some code with what you've done? Would be easier to get a better idea about what you're trying to do

from flaui.

var app = FlaUI.Core.Application.Attach("xxx.exe");
using (var automation = new UIA3Automation())
{
  var window = app.GetAllTopLevelWindows(automation).FirstOrDefault(t => t.Name == "Client.Main.Views.AppendViewModel");
  window.FindFirstDescendant(t => t.ByName("Accept")).AsButton()?.Invoke();
}

from flaui.

Can you please measure each call individually (app.GetAllTopLevelWindows, window.FindFirstDescendant) to see which of those 2 is the slower one?
If it indeed is the first one, you can always directly search the window directly:

var window  = automation.GetDesktop().FindFirstChild(cf =>
    cf.ByControlType(ControlType.Window)
    .And(cf.ByProcessId(app.ProcessId))
    .And(cf.ByName("Client.Main.Views.AppendViewModel"))
);

from flaui.

GetAllTopLevelWindows is slower, taking 3 seconds, but the new method you provided is effective, reducing the time to 0.2 seconds. Additionally, GetAllTopLevelWindows is not as slow as before, perhaps because my system has been restarted.

from flaui.

When it gets all windows from the top level (desktop), UIA queries the Windows-Objects underneath and it might encounter a window (application) that is hanging for some time until it responds, making the whole request slow. If you want, you could try to get each window from the GetDesktop individually and see, if there is one or a few that takes longer to get a response.

from flaui.

How do I enumerate it? The code in the loop passes quickly, and the time is concentrated on FindAllChildren.
foreach (var element in automation.GetDesktop().FindAllChildren(a => a.ByControlType(FlaUI.Core.Definitions.ControlType.Window)))
{
element.Name.Dump();
element.FindAllChildren();
}

from flaui.