How would I make rain for a third person game with multiple cameras?

Does any know how I would do this. I understand the technique of pinning a rain participial to each camera but I don't think that will work. I am make a third person game with many stuck cameras at different positions so I don't want to have to deactivate the different rain prefabs when the game triggers the rain to stop or star again. I've tried more basic ways to get rain in my game but even one rain participial seems to destroy my frame rate :(. I guess what I'm looking to do ir something like the rain effects in GTA V. I really wish unity would integrate a weather system along the lines of how rain works in Cryengine. Any thoughts?? Thanks you. Any help is appreciated.