Hi Sam,
The material is pretty much completely different, it’s a transparent “VFX-ey” material while the regular material is a metallic hard surface material. We need to do a full material swap; custom data / material parameters are not going to cut it. Is this amount of cost really expected from just a material swap? Like I said completely recreating the ISMs from scratch (i.e. completely new components) with the exact same number of instances as the old ones is 10x faster. That seems like it has to be a bug or some issue. Changing the material seems like it should be doing much less work under the hood. Can you provide some insight into what is making this cost so much?