Grid performance | Infragistics Forums

Data get stored in the session : retrieved once and maintained there until saved... the big grid on the first tab also some filtering capabilities implemented, the rest seems like minor addition, here is the binding on the page load and the mark up page attached:

if (IsPostBack)
            {
                if ((ExhibitLR2MasterDS)Session["ExhLR2MasterDS"] != null)
                {
                  // ExceptionUtility.LogException("Due~~PageLoad PostBack, Data exists: " + DateTime.Now.ToString("MM/dd/yyyy hh:mm:ss.fff tt"));
                    ExhibitLR2MasterDS MasterDS = (ExhibitLR2MasterDS)Session["ExhLR2MasterDS"];
                    ExhibitLR2MasterDS.ExhLR2MasterTblDataTable MstTbl = MasterDS.ExhLR2MasterTbl;

                    uc_top_refresh.wddTopAcctFilters.AutoPostBackFlags.ValueChanged = Infragistics.Web.UI.AutoPostBackFlag.On;
                    string filter = uc_top_refresh.wddTopAcctFilters.SelectedValue;

                    if (hdnAccountFilterVal.Value != filter)
                    {
                        hdnAccountFilterVal.Value = filter;
                        whdg.GridView.ClearDataSource();
                        whdg.GridView.Rows.Clear();
                        MstTbl.DefaultView.RowFilter = filter;
                        whdg.DataSource = MasterDS;   // (ExhibitLR2MasterDS)Session["ExhLR2MasterDS"];
                        whdg.DataBind();
                        whdg.GridView.RequestFullAsyncRender();
                    }
                    else
                    {
                        MstTbl.DefaultView.RowFilter = hdnAccountFilterVal.Value;
                        whdg.DataSource = MasterDS; // (ExhibitLR2MasterDS)Session["ExhLR2MasterDS"];
                        whdg.DataBind();
                    }

                    ExhibitLR2DetalsDS ExhLR2DetailsDS = (ExhibitLR2DetalsDS)Session["ExhLR2DetailsDS"];
                    wdgSrv.DataSource = ExhLR2DetailsDS.SurveyTbl;
                    wdgSrv.DataBind();
                    // SynchronizedExtra();
                    //BindExtra();
                }