Firefly Performance Optimization Idea

TLDR: Fireflies to function like dragon breath to improve performance

I have heard a lot of other users make their fear heard that fireflies might become very laggy. To combat this I suggest implementing fireflies similar to dragon's breath. This means that a swarm of fireflies is just one entity and interaction with this entity (like a frog eating a firefly) would change its size. 

If possible, it should be implemented in such a way that firefly particles don't start and stop existing stochastically but that they should be persistent. This would give them the appearance of not just being another particle effect. Cheers.