USB-CDC

Hi im currently working on USB drivers for LP2468 MCU.I want to send data to the host PC as fast as I can.Since i dont have much knowledge on USB HID development on the PC end Ive decided to implement USBCDC class which will appear as a virtual comport on PC.
In my code i have initialised USB using the following statements

CDC_Init (); /*VCOM Initialization*/
USB_Init( EA_BOARD_LPC24XX );
USB_Connect(TRUE);

After i get USB_Configuration flag when an USB cable is
connected i send data to PC using

USB_WriteEP (CDC_DEP_IN,str,len );

Where str is the string i want to write and len is the length

This works as far as I insert a delay between 2 succesive USB writes.
If i reduce the delay the MCU hangs.Ive tried increasing the buffer size by sending more data collectively by changing usbpacket size
#define USBPKTLEN 1000

i have also commented out the following code as im not using CDC to send data packets to the serial port

void USB_EndPoint2 (DWORD event) {

switch (event) { case USB_EVT_OUT: /// CDC_BulkOut (); /* data received from Host */ break; case USB_EVT_IN: // CDC_BulkIn (); /* data expected from Host */ break; }
}

Can someone please suggest what measures can i take to increase the throughput of USBCDC or is there anyway to monitor the status of USB clear to send flag if any
Thank you

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