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You can open multiple terminal windows/tabs and use rostopic echo in each one, or you spawn multiple copies of rostopic, all echoing to the console.

rostopic echo /nodename/topic1 & rostopic echo /nodename/topic2 & rostopic echo /nodename/topic3 & ...

But you might find it more useful to use rostopic hz or rostopic bw to see the publish rate or bandwidth for some of these topics. It may be more likely that your main loop is publishing faster than you need. Are you using a rospy.Rate to publish at regular intervals, as in this rospy tutorial? (For the C++ code counterpart see this tutorial.)