Publishing rate decreases when multiple nodes are publishing

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I have 4 nodes running on a Raspberry Pi that collect data from an IMU, GPS, and 2 potentiometers, and publish to a single rosbag. When only the GPS node is running, the GPS node will publish at 1 Hz. But when the potentiometer node is also running at the same time this decreases to about .3 Hz. The other sensors experience a similar reduction when all nodes are running simultaneously.

Is there a way to modify the potentiometer node script below to prevent this?

#! /usr/bin/env python

import rospy
from std_msgs.msg import UInt32
import Adafruit_ADS1x15

adc = Adafruit_ADS1x15.ADS1015()
GAIN = 1
adc.start_adc(0, gain=GAIN)

def talker():
    pub = rospy.Publisher('steerangle', UInt32, queue_size=50)
    rospy.init_node('talker', anonymous=True)
    rate = rospy.Rate(5)
    while not rospy.is_shutdown():
        value = adc.get_last_result()
        rospy.loginfo(value)
        pub.publish(value)
        rate.sleep()

if __name__ == '__main__':
    try:
        talker()
    except rospy.ROSInterruptException:
        pass