Can't change how many fps my niagara system is running at UE5.2

Hello, I’ve made this simple fire niagara system, but I’ve noticed that no matter what framerate I set for it to play at, it plays at the same fps in the viewport. Any ideas why?

I am having this issue too, I am trying to cache the animation out at 240 fps so I can make a slow motion video but 1. I can’t change the sims fps and 2. the cache at 240fps looks different to the cache at 30fps but I assume this is due to point 1.