getCurrentPose take too long time

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I called moveit’s move_group::getCurrentPose() to get the position of the endeffector of a universal robot, but I found it takes more than 1 secs, Real-time performance can not meet the requirements. Is there any solution to improve the real-time of the API, or I just do the forward kinematics through tf will be okay. Here is part of my code

  ros::Time getpose_begin_time = ros::Time::now();
  static const std::string PLANNING_GROUP = "manipulator";
  moveit::planning_interface::MoveGroupInterface move_group(PLANNING_GROUP);  
  current_pose = move_group.getCurrentPose().pose;
  double getpos_time = (ros::Time::now() - getpose_begin_time).toSec();
  ROS_INFO ("%f secs for getting pose.", getpos_time);

Here is the ourput ROS_INFO