generative modeling for Rhino
This is either
a) your Mesh settings are too jagged in which case go to Rhino Options > Mesh and tick "Smooth & Slower" or Custom settings and play around with the density slider.
b) your object is a very, very long way from the origin in which case Rhino struggles with floating point precision with very, very large numbers.
Thank you, Danny! The "custom settings" work.
Check your rhinos mesh settings.
Thank you, Hannes!