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What speed exactly do your what to reduce?

If you want to reduce the rate at which a message callback is being called, you can use topic_tools throttle:

http://wiki.ros.org/topic_tools/throttle

If you want to adjust an internal loop you can embed a ros::Rate, call .sleep() on it like in the tutorial (http://wiki.ros.org/ROS/Tutorials/WritingPublisherSubscriber(c%2B%2B)#roscpp_tutorials.2BAC8-Tutorials.2BAC8-WritingPublisherSubscriber.Writing_the_Publisher_Node) and use a ros parameter to set the loop rate in your node from the param server without having to change your code....