Index: __init__.py
==================================================================
--- __init__.py
+++ __init__.py
@@ -314,13 +314,10 @@
 		if reg & 0x80 == 0x80:
 			self._debug(" regRead[%02X] = %s" % ((reg & 0x7f), result))
 		else:
 			self._debug("regWrite[%02X:0x%02X%02X] = %s" % (reg, high, low, result))
 
-		#if reg & 0x80 != 0x80:
-		#	time.sleep(delay / 1000.0)
-
 		return result
 
 	def put_register(self, reg, value):
 		high = (value >> 8) & 0xff
 		low  = value & 0xff
@@ -491,20 +488,21 @@
 			radio_status = self.get_register_bits('status')
 			self._debug("radio_status={}".format(radio_status))
 
 			if radio_status['packet_flag'] == 1:
 				break
-			time.sleep(0.1)
+			time.sleep(0.001)
 
 		return True
 
 	def multi_transmit(self, message, channels, retries = 3, delay = 0.1):
 		for channel in channels:
 			for i in range(retries):
 				if not self.transmit(message, channel):
 					return False
-				time.sleep(delay / retries)
+				if delay != 0:
+					time.sleep(delay / retries)
 		return True
 
 	def start_listening(self, channel):
 		# Initialize the receiver
 		self.stop_listening()