Seems likely. Let me know if you find out more so I can specifically check this. I dont think its sexy fluids though, because my plugin uses this regularly and rhere is no throbbing to my knowledge.My FPS is always between 10 and 15 (I have multiple models). But I suspect it's more of a conflict with another script. Maybe BodyLanguage or SexyFluids. Perhaps even Kimowal.micro_physics_fixer... It's stopped doing it for now, so I really don't know what triggers it. I have two men in my scene, and it throbs at the same time—it's synchronized.