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Hi Atom,

I haven't tried this with my TurtleBot, but I think you can lower the max_vel_x parameter in the file base_local_planner_params.yaml which is found in the config directory of the turtlebot_navigation package. The default value is 0.50 m/s. You might also try tweaking some other parameters in that file such as:

  min_vel_x: 0.10
  max_rotational_vel: 1.5
  min_in_place_rotational_vel: 1.0
  acc_lim_th: 0.75
  acc_lim_x: 0.50
  acc_lim_y: 0.50