Hi Paul, thanks for the reply. After a bunch of digging around, I found out that it was a bug in the Unity Profiler where some unrelated code (fog of war, which uses a shader, not popcorn fx) was being logged as PkFxRenderingPlugin in the profiler. It didn't seem to happen when I did a Deep Profile. Once I fixed the fog of war code, the GC Alloc on PkFxRenderingPlugin went away.