Epson Receipt Printer prints very slow (POS for .NET)

Information you need:

• .Net Framework 4.0
• VS 2010 , C#
  
• Microsoft.PointOfService.dll  Ver POS for .Net 1.12
• Epson TM-T20 Thermal Printer (USB port)

Everything is good and works fine, there is no problem with the codes and installations.

The Problem is when I want Print a simple Receipt with no Logo or image or bar code, It takes many times almost 20 Second for 25 simple lines. and print every lines with a little delay. and the printer is noisy like dot printer.

But, when I press TestPrint button in the Print Drive is very faster than my codes and no noise.

I am using the OPOS code for .Net which was provided in CD Driver of Epson.

this is  a sample of print code:

 m_Printer.PrintNormal(PrinterStation.Receipt, "\u001b|cA" + "*** Customer Copy***" + "\n");

Please, help me, I will get into trouble if I could not solve this problem.

Thanks,

Mehdi