title: RDLC LocalReport Export to Excel really slow
body: <p>We have an Asp.Net page running a RDLC Local report against an Oracle database in the backend, which is ridiculously slow when exporting to an Excel spreadsheet. I've done some investigation and established that the query itself shouldn't be to blame - I can run the query directly against Oracle using SQL Developer and export the results to Excel in around 5 seconds, yet when I run it via the asp.net page and the ReportViewer control it takes about 3 minutes to return.</p>
  
  <p>Does anyone have any suggestions as to why this is so slow? The query returns around 8000 lines each with about 30 columns, so it's not a tiny result set but it's not massive either. Any suggestions on how we can optimize the report would be much appreciated.</p>
  
  <p>I'm using Microsoft.ReportViewer.WebForms version 10.0.0.0, does anyone know if v11 has performance improvements?</p>
  
  <p><strong>EDIT:</strong> Tried ReportViewer v11, no improvement in speed. </p>