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Generate static geometry – when on– When enabled, V-Ray will subdivide subdivides the NURBS surface into triangles before the actual rendering has begun. This allows the building of a faster intersection structure, but takes more memory. When off, NURBS surfaces will be are treated as dynamic geometry, similar to Subdivision meshes, and will be are converted into triangles on the fly. This saves memory for other purposes, but may be slower.

Max tessellation depth  this  This parameter controls the maximum number of triangles that V-Ray is allowed to generate for this NURBS surface. Note that this number is proportional to the logarithm of the actual number of triangles, so you don't need very high values. Also if you want to lower the quality of the NURBS surfaces, it is better to do this by increasing the Curvature threshold parameter, rather than lowering this one.

Curvature threshold  decrease  Decrease this parameter to allow V-Ray to subdivide the NURBS surface more, for a smoother result. Increase it for faster rendering and less RAM usage, but lower quality.