Still not seeing the same when adding a light module for the collision issue. 
As for performance loss I would expect some type of hit depending on the number of particles being spawned because it will be movable lights being spawned. In my example I see a significant FPS loss because I’ve got a good number of particles spawning.
For now I’ll mark this as resolved since I’m not able to reproduce. Should this be an issue please provide the full setup for the Particle System or a simple test project and I can take it from there to investigate.
Thank you!