Best practice for multiple splines

[digot]

Hello!

I need to extrude meshes out of multiple splines using Generators. The game already joins splines that can be joined but I feel like the performance could still be enhanced.

Is it better to use one generator per spline or one generator for like 5 splines or one generator for all splines? 

Also when using NOT Auto Refresh, does the Curvy Splines or Generator have any impact on performance after everything was extruded?

Thanks!