UI updates related to results take significant time even when results tab is not shown

[gkronber]

Reproduce

1. Open and run GA-TSP sample without showing the results. Execution time ~7sec
2. Open and run GA-TSP sample showing the results tab. Execution time ~15sec
3. Change AlgorithmView to never set the Content for the results tab. Execution time ~3sec

       protected override void OnContentChanged() {
         base.OnContentChanged();
         if (Content == null) {
           parameterCollectionView.Content = null;
           problemViewHost.Content = null;
           resultsView.Content = null;
           runsView.Content = null;
           storeAlgorithmInEachRunCheckBox.Checked = true;
         } else {
           parameterCollectionView.Content = Content.Parameters;
           problemViewHost.ViewType = null;
           problemViewHost.Content = Content.Problem;
   -->     //   resultsView.Content = Content.Results.AsReadOnly();
           runsView.Content = Content.Runs;
           storeAlgorithmInEachRunCheckBox.Checked = Content.StoreAlgorithmInEachRun;
         }
       }
   

A solution would be to check which tab is currently active and set the content to null for each ViewHost which is currently not visible. A sketch is given below. Additionally, it would be necessary to also update all embedded ViewHosts, especially the ViewHost showing the value of the selected result.

protected override void OnContentChanged() {
  base.OnContentChanged();
  if (Content == null) {
    parameterCollectionView.Content = null;
    problemViewHost.Content = null;
    resultsView.Content = null;
    runsView.Content = null;
    storeAlgorithmInEachRunCheckBox.Checked = true;
  } else {
    if (tabControl.SelectedTab == problemTabPage) { problemViewHost.Content = Content.Problem; } 
    else if (tabControl.SelectedTab == parametersTabPage) { parameterCollectionView.Content = Content.Parameters; } 
    else if (tabControl.SelectedTab == resultsTabPage) { resultsView.Content = Content.Results.AsReadOnly(); }
    else if (tabControl.SelectedTab == runsTabPage) { runsView.Content = Content.Runs; }
    storeAlgorithmInEachRunCheckBox.Checked = Content.StoreAlgorithmInEachRun;
  }
} 

...

private void tabControl_Selected(object sender, TabControlEventArgs e) {
  if (Content == null) return;
  if (e.TabPage == problemTabPage) { problemViewHost.Content = Content.Problem; }
  else if(e.TabPage == parametersTabPage) { parameterCollectionView.Content = Content.Parameters; }
  else if(e.TabPage == resultsTabPage) { resultsView.Content = Content.Results.AsReadOnly(); }
  else if(e.TabPage == runsTabPage) { runsView.Content = Content.Runs; }
}