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A lot of factors add to the real time factor you see on Gazebo. Foe example:

• How complex is your model and whether inertial tensor you have used match with the collision you are using in xacro/urdf file
  • How many models you have spawned in Gazebo
  • How many nodes you are running
  • What is the publish rate of those nodes
  • Are you using sensors like laser, camera, GPS, etc. A good remedy can be to run the simulation at the slower than real time. Also try to simplify your model.