Forum Post: cc251x radio data rate

Hi, I have a question regarding the cc251x radio data rate.  The following is from the cc2510 mini development kit software example, to send a 2-byte data,

********************************************************************************************************

for( uint8_t x = 0; x < NUM_TX_RETRIES; x++ )

{
SMPL_Send(sLinkID, radioMsg, sizeof(radioMsg));

/* Turn on RX. default is RX Idle. */
SMPL_Ioctl( IOCTL_OBJ_RADIO, IOCTL_ACT_RADIO_RXON, 0);

SPIN_ABOUT_QUARTER_A_SECOND; /* Might have to be longer for bigger payloads */
if( sSemaphore )
break;
}

********************************************************************************************************

After sending, there is "SPIN_ABOUT_QUARTER_A_SECOND" before sending again, is this waiting for the Semaphore to set?

Now, I guess the 0.25 second waiting slows down the radio, because I don't see much difference at the data transmission speed if I set the radio at 500k Bauds vs. 2.4k Bauds. 

With this 0.25 second waiting, how do I increase the data rate?  Does larger payload per packet help?

Thanks!