in the tutorial 
http://www.ros.org/wiki/ROS/Tutorials/UsingRxconsoleRoslaunch
UsingRxconsoleRoslaunch 

"You will see the two turtlesims start moving even though the publish
command is only being sent to turtlesim1. "
the picture shows that there is a delay between the two turtlesims. but for
me both the sims are synchronised without delay. which is correct?
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