Rdlc to PDF rendering slow - asp.net-mvc

Question

We've been doing timing on some of our slow PDF reports on our asp.net mvc3 web app,
One in particular kinda blew our mind...
SQL - returned in a few nundred milliseconds
RDLC processing - a few hundred miliseconds
PDF generation - over 4 min
I've found this: http://social.msdn.microsoft.com/Forums/sqlserver/en-US/ca45fcc4-be69-410f-aaed-19b65f279330/reporting-services-sp1-slow-on-pdf-render
and this:
msdn page 2
Explaining how to address it by optimizing the RDLC, but I wanted to make sure I wasn't doing anything stupid in my c# code.
Here is the section that takes the RDLC and renders it as a PDF, it looks pretty simple, but am I doing it in the optimal way? Am I following best practices?
// build the byte stream
answerBytes = localViewer.Render(
args.ReportType, args.DeviceInfoXML, out mimeType, out encoding, out fnameExt,
out streamids, out warnings );
// send out vars back to client.
args.MineType = mimeType;
args.FnameExt = fnameExt;
// dispose of local viewer when complete
localViewer.Dispose();
netLogHdl.Trace( "Done PDF work " );
return answerBytes;
PDF Generation is SOO Bad I feel like I must have dome something wrong...
P.S. here is more of the stack if it's needed
public byte[] ByteStreamPdf(ref ByteStreamReportArgsCV args)
{
//The DeviceInfo settings should be changed based on the reportType
//http://msdn2.microsoft.com/en-us/library/ms155397.aspx
string deviceInfo = "<DeviceInfo>";
deviceInfo += "<OutputFormat>PDF</OutputFormat>";
if (args.Landscape)
{
deviceInfo += "<PageWidth>11in</PageWidth><PageHeight>8.5in</PageHeight>";
}
else
{
deviceInfo += "<PageWidth>8.5in</PageWidth><PageHeight>11in</PageHeight>";
}
deviceInfo += "<MarginTop>0.5in</MarginTop><MarginLeft>1in</MarginLeft>";
deviceInfo += "<MarginRight>1in</MarginRight><MarginBottom>0.5in</MarginBottom>";
deviceInfo += "</DeviceInfo>";
deviceInfo = "";
args.DeviceInfoXML = deviceInfo;
args.ReportType = "Pdf";
return ByteStreamReport(ref args);
}
public byte[] ByteStreamReport(ref ByteStreamReportArgsCV args)
{
Warning[] warnings;
string[] streamids;
string encoding;
string fnameExt;
string mimeType;
byte[] answerBytes;
LocalReport localViewer = new LocalReport();
// enable external images... CR # 20338 JK
localViewer.EnableExternalImages = true;
// build the Report Data Source
// open up your .rdlc in notepad look for <datasets> section in xml
// use what you find on the next line.
ReportDataSource rds = new ReportDataSource(args.NameOfDatasetInRdlc, args.DataToFillReport);
// set the report path and datasource
IWebAccess webAccessHdl = ObjectFactory.GetInstance<IWebAccess>();
//next line was HttpContext.Current.Request.MapPath(args.RdlcPathAndFname); changed to use webaccess - EWB
localViewer.ReportPath = webAccessHdl.GetMapPath(args.RdlcPathAndFname);
localViewer.DataSources.Add(rds);
// add parameters that rdlc needs
if (args.RptParameters != null)
localViewer.SetParameters(args.RptParameters);
//Sub Report Task
if (args.SubReportDataToFillReport != null)
{
for (int i = 0; i < args.SubReportDataToFillReport.Length; i++)
{
ReportDataSource subRds = new ReportDataSource(args.SubReportNameOfDatasetInRdlc[i],
args.SubReportDataToFillReport[i]);
localViewer.DataSources.Add(subRds);
}
if (args.SubReportDataToFillReport.Length > 0)
localViewer.SubreportProcessing +=
LoadSubreportProcessingEventHandler;
}
//End of Sub Report Task
// build the byte stream
answerBytes = localViewer.Render(
args.ReportType, args.DeviceInfoXML, out mimeType, out encoding, out fnameExt,
out streamids, out warnings);
// send out vars back to client.
args.MineType = mimeType;
args.FnameExt = fnameExt;
// dispose of local viewer when complete
localViewer.Dispose();
return answerBytes;
}