I'm happy to announce that Fluvio will support Shuriken particle collisions in Unity 4! Currently, Fluvio operates by running the fluid solver on rigidbodies, which automatically resolve collisions. While this works, it's not very efficient and produces a lot of overhead. Every particle needs a gameobject with a ridigbody attached. Things such as complex friction and rotation get considered as well, when they don't need to be. With Unity's support for full collision for Shuriken particles, we can skip all of this and have Fluvio affect particles directly. No hard numbers just yet, but expect a performance increase by orders of magnitude. I hope to have some more news on this very soon!