Setting the SettingsFilterControl.AllowHierarchicalColumns property to true reduces ASPxGridView performance when the latter is bound to a complex datasource

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In an XAF application, you can work around this problem by setting the ASPxGridView.SettingsFilterControl.AllowHierarchicalColumns property to false in a ViewController:

Code
using DevExpress.ExpressApp;  
using DevExpress.ExpressApp.Web.Editors.ASPx;  
 namespace AppPPM.Module.Web.Controllers {  
    public class DisableHierarchicalColumnsFilterViewController:ViewController<ListView> {  
        public DisableHierarchicalColumnsFilterViewController():base() {  
            TargetViewId = "PPM_ProjectPortfolio_ListView_Dashboard_NoExpand";//comment this line to apply this ViewController to all ListView controls  
        }  
        protected override void OnViewControlsCreated() {  
            base.OnViewControlsCreated();  
            ASPxGridListEditor editor = View.Editor as ASPxGridListEditor;  
            if(editor != null)  
                editor.Grid.SettingsFilterControl.AllowHierarchicalColumns = false;  
        }  
    }  
}