I have a physics object that has two kinds of particle emitter on them for spewing out smoke. Each emitter is set up the same (except for some cosmetic differences). However, the particles from the smoke stacks seen below jitter, whereas the particles coming from the vents at the back are smooth. Why would the smoke stacks jitter? This only happens when moving at speed. One difference between these two objects is where they sit in the hierarchy. The object hierarchy is: Cloudship [Rigidbody with forces acting on it] Vents Empty Game Object Left Vent Empty Game Object Vent Particles [Particle Emitter] (Same for right hand side) Buildings Game Object Smoke stack [Kinematic Rigidbody] Particle Emitter Version: 2018.2.1 Lightweight Render pipeline: 1.1.11 Is there any more information you require? Thanks in advance.