Performances

Curve opacity

Using opacity on curves can be slow to render, in this case use a fast opacity mode : Set the Surface → Opacity Mode attribute to UV or Vertex.

See also : Opacity for the details.

Curves and global illumination

When rendering the curves with GI, consider the following optimizations :

1. Use the minimal Curves → Diffuse/Specular → Depth possible.
2. Reduce the Curves → Diffuse/Specular → Ray Length attribute.
3. Remove the curve objects from the Diffuse and the Reflection set.