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Hints on performance:

When displacing objects, RenderMan uses a screen projection to dice objects finely into micropolygons. This typically needs no user adjustment and handles level of detail automatically as objects further away are covered by fewer pixels and diced more coarsely.

There are two ways to adjust this should it not meet your requirements.

1. Add a new dicing strategy to the object, Dice Strategy > Spherical
2. Decrease the size of the polygons by adding, Micropolygon Length and reducing this number slowly (decreasing the size of the resulting polygons).