I made a module to create film grain using the edible images API. It’s very cool and also cooler. You might face some problems as I haven’t tested everything, but since I’m also as cool as the module, it should all work. 
I just found this emoji and it looked funny.
The way it works is that it makes a pool of like 20 created film grain images and then reuses them (if the variable is true) and once the pool is filled then you can speed the effect up without any performance loss.
Links to it:
File - Film Grain File.rbxm (7.4 KB)
Video - Can’t upload since it’s like 10.01 MB
Model - Film Grain Model
Script - Can’t paste it