So after many pains I’m sure that this is not a sorting issue. The particle system I have attached to a rigid body will start to flicker once the rigidbody reaches a high enough speed. If the rigidbody slows down then the particles stop flickering. Any ideas on how one could fix this?
Well I found a solution. For anybody else that has this issue: the flickering was, indeed, a result of making the particle system a child of the high velocity rigid body. The fix was to attach the particle system to the rigid body with a fixed joint instead.
Not sure why this works as neither one is using interpolation but whatever.
I was experiencing this as well. Removing it from the moving object fixed the problem. I had the transform of the particle scaled, and setting the scale back to (1,1,1) fixed the problem as well.
Bumping old thread.
The problem still exists in version 5.3
My rocket flies off screen and the smoke it leaves behind flickers. Hope Unity Devs can fix this in 5.4
They can’t fix what they don’t know about - report a bug.
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Does enabling interpolation on the rigid body fix the issue? We do have changes in the works to handle rigid body velocity in a better way but flickering is not a known issue.
Speaking of which I’ve had all sorts of problems with child/parent relationships and rigidbody problems that I’ve worked around with trial and error - in short it’s one of those things I’m never sure if is actually a bug or not…
What sort of problems? File a bug, what’s the worst that could happen 
Indeed! just problems with drift, child objects jitter and drift or just plain jerk.
Hmmm, doesn’t sound right. File a bug and we can see what’s going on 