If the core object does not roll as expected, check the following:

• Make sure the Origin of the core object is located near the center of its geometry.
  
• Check that the Scale and Rotation of the core object have been applied.
  
• Make sure the timeline is playing.
  
• Check that the Geometry Nodes simulation is working correctly.
• If you changed any simulation-related values, replay the timeline from the beginning.

If the objects in the Pickup Collection do not attach correctly, check the following:

• Make sure the Origins of the pickup objects are not too far from the bottom of each object.
• Check that the transform values of the pickup objects have been applied.
• Make sure the pickup objects are not placed too densely.
• Check that the objects are correctly placed inside the assigned Pickup Collection.
• Make sure the correct collection is assigned to the Pickup Collection parameter.

If the scene becomes too slow or heavy, check the following:

• Make sure the pickup objects do not have too many polygons.
• Use simpler mesh objects for better performance.
• Reduce the number of pickup objects if needed.
• Lower the Max Pickups value.
• Reduce heavy viewport display settings while testing.
• Bake the simulation before rendering or previewing a complex scene.