help please

the scene you uploaded won't render since the Tracer traces particles, or points from splines or poly objects. Once I made your sphere editable it will render but slowly since each one of the default spheres 266 points are traced, which means the SweepNurb is tracing that circle along 266 splines.
Reduce the points in the sphere to minimum or make a spline with as many points as you want to trace, that should make it workable.