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There could be a few reasons for this:

1. Scaling: Make sure the model is scaled correctly. If the model is too large, it may appear to move less compared to the physics simulation.

2. Mass and force: Check the mass and force of the model in your code. If the mass is too high and the force is too low, the model may move sluggishly.

3. Collision shape: Make sure the collision shape of the model is accurate. If the shape is too simple or not accurate, the physics simulation may not be able to properly simulate the movement.

4. Constraints: Check if any constraints are applied to the model. If the constraints are too restrictive, the movement may be limited.

5. Inaccurate model: It is possible that the imported model is not accurate or does not have the correct physical properties. In such cases, adjustments may need to be made to the model or the physics simulation to ensure accurate movement.