I have a flip sim which contains 30 million particles, when I use a cube as an instance object to instance on those points, the render just hang there, and the memory usage goes up quickly and eat up my 64G memory eventually, then the renderer stops working.

Want I want is to render those millions of points as custom shape not the default sphere look.So instance should be the way to go, however, with huge number of points, the instance work flow seems broken. What should I do to make it work?