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Alternative using python directly

I now stopped working on rosserial and implemented an own python based interface:

#!/usr/bin/env python
import rospy
from std_msgs.msg import String

import serial           
import time
ser = serial.Serial('/dev/ttyACM0', 115200)

pub = rospy.Publisher('chatter', String)
rospy.init_node('talker')


while 1:
 a = ser.readline()
 pub.publish(String(a))

If I have an arduino loop of

void loop() {
   Serial.println("OFF");
}

the frequency is enough for my needs:

rostopic hz chatter

gives be above 10kHz.