Niagara Sys SizeMap too big, how reduce?

I have 2 Niagara Systems spawn at the same time and both are roughly 10MB each, so I’ve set soft references. I am wondering though about unloading the assets because they won’t be needed much, does the Soft Reference unload when finished?

Are there any other ways to reduce Niagara Systems? Some of their BPs are kinda big.